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Linux EUVDEUVD-2026-13607

| CVE-2026-23272 HIGH
Use After Free (CWE-416)
2026-03-20 Linux
Information Disclosure Linux Use After Free Memory Corruption
7.8
CVSS 3.1 · Vendor: Linux
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Craft malicious netfilter rule
  2. Delivery
    Trigger set full condition
  3. Exploit
    Publish element without RCU grace period
  4. Execution
    Access freed memory via RCU reader
  5. Impact
    Execute arbitrary code with elevated privileges

Vulnerability Assessment

Weakness
CWE
CWE-416
ASVS 5.0
V15 - Secure Coding and Architecture Memory lifecycle management
MITRE ATT&CK

2 techniques across 2 tactics: Execution, Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Exploitation Conditions

Attacker requires low-privilege local user access to a Linux system running an affected kernel version. No user interaction needed. Exploitation occurs when nf_tables set reaches capacity during element insertion, causing use-after-free via premature RCU grace period.
Impact

While CVSS and EPSS scores are not provided in the intelligence data, the vulnerability's severity can be assessed through other signals. The vulnerability is a use-after-free condition (CWE-416), which typically carries high impact for information disclosure and denial of service. The affected product is the Linux kernel with broad version coverage (4.10 through 7.0-rc3 and recent stable patches), indicating widespread exposure. The attack vector appears to be local (requires ability to manipulate netfilter rules, typically restricted to root or CAP_NET_ADMIN), which reduces the exploitability from a network perspective but increases risk in multi-tenant or containerized environments where privilege escalation is a concern. The fact that the Linux kernel maintainers provided patches across multiple stable branches (6.18.17, 6.19.7, and others per EUVD-2026-13607) and committed fixes to the mainline (ccb8c8f3c1127cf34d18c737309897c68046bf21, def602e498a4f951da95c95b1b8ce8ae68aa733a, 6826131c7674329335ca25df2550163eb8a1fd0c) suggests this was actively managed as a real priority. The race condition requires specific timing but is reproducible through batch operations on full sets, making it practically exploitable in controlled scenarios. This is a legitimate kernel-level vulnerability requiring patching rather than a theoretical risk.
Exploit ScenarioDerived

An attacker with local system access or container escape capabilities could exploit this by executing netfilter commands to create a set at maximum capacity, then rapidly submit batch requests to add elements to the full set. The race condition in element insertion could cause the kernel to use freed memory, leading to information disclosure if sensitive kernel data is leaked, or denial of service if the crash occurs on critical systems. The attack requires CAP_NET_ADMIN capability or root access, limiting the threat to privilege escalation scenarios or systems where unprivileged users have already been granted netfilter manipulation rights. No public proof-of-concept is explicitly mentioned in the intelligence, but the reproducibility via batch operations makes practical exploitation feasible for attackers with the necessary access level.
Act Now Prioritize within 24-48h. Why: Active threat signals + CRITICAL/HIGH severity.
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 20, 2026

A use-after-free vulnerability exists in the Linux kernel's netfilter nf_tables subsystem where a set element can be published and removed without waiting for RCU grace period completion, allowing concurrent RCU readers to access freed memory. This affects all Linux kernel versions across multiple stable branches (4.10 and later) as indicated by the CPE cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*. An attacker with local access to manipulate netfilter rules could trigger information disclosure or denial of service by exploiting the race condition during batch insertion of elements into a full netfilter set.

RemediationAI

The primary remediation is to upgrade the Linux kernel to a patched version: Linux 6.18.17 or later for the 6.18.x series, Linux 6.19.7 or later for the 6.19.x series, or apply the upstream fixes (commits 6826131c7674329335ca25df2550163eb8a1fd0c, ccb8c8f3c1127cf34d18c737309897c68046bf21, def602e498a4f951da95c95b1b8ce8ae68aa733a) available at https://git.kernel.org/stable/. Distributions should check their kernel version against the affected versions listed in EUVD-2026-13607 and apply the corresponding security updates. Until kernel patching is completed, restrict access to netfilter configuration utilities (nft, iptables) to trusted administrators only by enforcing CAP_NET_ADMIN restrictions in container security policies and SELinux/AppArmor profiles. Monitor systems for exploitation attempts by logging netfilter rule modifications and system errors related to set operations.

Affected VersionsENISA

Linux patch: 6.18.17
Linux 35d0ac9070ef619e3bf44324375878a1c540387b <ccb8c8f3c1127cf34d18c737309897c68046bf21
Linux fefdd79403e89b0c673965343b92e2e01e2713a8
Linux 4.10
Linux patch: 0
Linux patch: 7.0-rc3
Linux 35d0ac9070ef619e3bf44324375878a1c540387b <def602e498a4f951da95c95b1b8ce8ae68aa733a
Linux patch: 6.19.7
Linux 35d0ac9070ef619e3bf44324375878a1c540387b <6826131c7674329335ca25df2550163eb8a1fd0c

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Technical ContextAI · show details

The vulnerability resides in the Linux kernel's netfilter subsystem, specifically in the nf_tables (netfilter tables) implementation which provides a framework for packet filtering and network address translation. The root cause is a race condition in the element insertion logic for netfilter sets. When a set reaches capacity and a new element insertion is attempted, the kernel previously incremented the set element counter and published the element but removed it without synchronizing with the Read-Copy-Update (RCU) mechanism that protects concurrent readers. RCU is a synchronization primitive that allows readers to traverse kernel data structures locklessly; failing to wait for a grace period before freeing memory allows readers that started before the deletion to continue accessing freed memory. The fix modifies the transaction handling to unconditionally add the element transaction even when the set is full, then set a flag to report -ENFILE error, allowing the abort path to safely unwind changes. This addresses the CWE-416 (use-after-free) vulnerability class. Affected CPE: cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*

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Severity by source

Vendor (Linux) PRIMARY 7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Ubuntu MEDIUM
SUSE HIGH
Red Hat 5.5 MEDIUM

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
CVE Published
Mar 20, 2026 - 08:08 nvd
HIGH 7.8

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables: unconditionally bump set->nelems before insertion

In case that the set is full, a new element gets published then removed without waiting for the RCU grace period, while RCU reader can be walking over it already.

To address this issue, add the element transaction even if set is full, but toggle the set_full flag to report -ENFILE so the abort path safely unwinds the set to its previous state.

As for element updates, decrement set->nelems to restore it.

A simpler fix is to call synchronize_rcu() in the error path. However, with a large batch adding elements to already maxed-out set, this could cause noticeable slowdown of such batches.

Threat Intelligence Overview

EPSS Score
0.0%
Top 96% exploitable
Threat Intel
1
1 source
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS CISA Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat Yes
Deciding rule
Active threat signals + CRITICAL/HIGH severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

49
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +39
PoC: 0
Weaponized: 0
Threat intel: +10
Gov advisory: 0

Attack Technique

Use After Free HIGH

Use-after-free vulnerabilities occur when a program continues to access memory through a pointer after that memory has been deallocated.

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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CVE-2026-23277 MEDIUM
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CVE-2026-23275 HIGH
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Same weakness CWE-416 – Use After Free

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CVE-2013-2551 HIGH POC
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Same technique Information Disclosure

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CVE-2019-2725 CRITICAL POC
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CVE-2021-34523 CRITICAL POC
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CVE-2013-2251 CRITICAL POC
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CVE-2025-68613 HIGH POC
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CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5

Vendor StatusVendor

Ubuntu

Priority: Medium
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linux-gke-5.15
Release Status Version
focal ignored end of kernel support
jammy DNE -
noble DNE -
questing DNE -
upstream ignored end of life
linux-gkeop
Release Status Version
focal ignored end of kernel support
jammy needs-triage -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-gkeop-5.4
Release Status Version
bionic ignored end of kernel support
jammy DNE -
noble DNE -
questing DNE -
upstream ignored end of life
linux-gkeop-5.15
Release Status Version
focal ignored end of kernel support
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-ibm
Release Status Version
focal needs-triage -
jammy needs-triage -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-ibm-5.4
Release Status Version
bionic needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-ibm-5.15
Release Status Version
focal needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-ibm-6.8
Release Status Version
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-intel-5.13
Release Status Version
focal ignored end of kernel support
jammy DNE -
noble DNE -
questing DNE -
upstream ignored end of life
linux-intel-iotg
Release Status Version
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-intel-iotg-5.15
Release Status Version
focal needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-iot
Release Status Version
focal needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-intel-iot-realtime
Release Status Version
jammy ignored superseded by Ubuntu Pro ppa version
noble DNE -
questing DNE -
upstream needs-triage -
linux-lowlatency
Release Status Version
jammy needs-triage -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-lowlatency-hwe-5.15
Release Status Version
focal needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-lowlatency-hwe-5.19
Release Status Version
jammy ignored superseded by linux-lowlatency-hwe-6.2
noble DNE -
questing DNE -
upstream ignored superseded by linux-lowlatency-hwe-6.2
linux-lowlatency-hwe-6.2
Release Status Version
jammy ignored superseded by linux-lowlatency-hwe-6.5
noble DNE -
questing DNE -
upstream ignored superseded by linux-lowlatency-hwe-6.5
linux-lowlatency-hwe-6.5
Release Status Version
jammy ignored superseded by linux-lowlatency-hwe-6.8
noble DNE -
questing DNE -
upstream ignored superseded by linux-lowlatency-hwe-6.8
linux-lowlatency-hwe-6.8
Release Status Version
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-lowlatency-hwe-6.11
Release Status Version
jammy DNE -
noble ignored replaced by linux-hwe-6.14
questing DNE -
upstream ignored replaced by linux-hwe-6.14
linux-nvidia
Release Status Version
jammy needs-triage -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-nvidia-6.2
Release Status Version
jammy ignored superseded by linux-nvidia-6.5
noble DNE -
questing DNE -
upstream ignored superseded by linux-nvidia-6.5
linux-nvidia-6.5
Release Status Version
jammy ignored superseded by linux-nvidia-6.8
noble DNE -
questing DNE -
upstream ignored superseded by linux-nvidia-6.8
linux-nvidia-6.8
Release Status Version
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-nvidia-6.11
Release Status Version
jammy DNE -
noble ignored end of kernel support
questing DNE -
upstream ignored end of kernel support
linux-nvidia-lowlatency
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-nvidia-tegra
Release Status Version
jammy needs-triage -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-nvidia-tegra-5.15
Release Status Version
focal needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-nvidia-tegra-igx
Release Status Version
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-oracle
Release Status Version
xenial needs-triage -
bionic needs-triage -
focal needs-triage -
jammy needs-triage -
noble needs-triage -
questing needs-triage -
upstream needs-triage -
linux-oracle-5.0
Release Status Version
bionic ignored superseded by linux-oracle-5.3
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oracle-5.3
linux-oracle-5.3
Release Status Version
bionic ignored superseded by linux-oracle-5.4
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oracle-5.4
linux-oracle-5.4
Release Status Version
bionic needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-oracle-5.8
Release Status Version
focal ignored superseded by linux-oracle-5.11
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oracle-5.11
linux-oracle-5.11
Release Status Version
focal ignored superseded by linux-oracle-5.13
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oracle-5.13
linux-oracle-5.13
Release Status Version
focal ignored superseded by linux-oracle-5.15
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oracle-5.15
linux-oracle-5.15
Release Status Version
focal needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-oracle-6.5
Release Status Version
jammy ignored superseded by linux-oracle-6.8
noble DNE -
questing DNE -
upstream ignored superseded by linux-oracle-6.8
linux-oracle-6.8
Release Status Version
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-oracle-6.14
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-oracle-6.17
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-oem
Release Status Version
bionic ignored replaced by linux-hwe-5.4
jammy DNE -
noble DNE -
questing DNE -
upstream ignored end of life
linux-oem-5.6
Release Status Version
focal ignored superseded by linux-oem-5.10
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-5.10
linux-oem-5.10
Release Status Version
focal ignored superseded by linux-oem-5.13
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-5.13
linux-oem-5.13
Release Status Version
focal ignored superseded by linux-oem-5.14
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-5.14
linux-oem-5.14
Release Status Version
focal ignored replaced by linux-hwe-5.15
jammy DNE -
noble DNE -
questing DNE -
upstream ignored replaced by linux-hwe-5.15
linux-oem-5.17
Release Status Version
jammy ignored superseded by linux-oem-6.1
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-6.1
linux-oem-6.0
Release Status Version
jammy ignored superseded by linux-oem-6.1
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-6.1
linux-oem-6.1
Release Status Version
jammy ignored superseded by linux-oem-6.5
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-6.5
linux-oem-6.5
Release Status Version
jammy ignored superseded by linux-oem-6.8
noble DNE -
questing DNE -
upstream ignored superseded by linux-oem-6.8
linux-oem-6.8
Release Status Version
jammy DNE -
noble ignored superseded by linux-oem-6.14
questing DNE -
upstream ignored superseded by linux-oem-6.14
linux-oem-6.11
Release Status Version
jammy DNE -
noble ignored superseded by linux-oem-6.14
questing DNE -
upstream ignored superseded by linux-oem-6.14
linux-oem-6.14
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-oem-6.17
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-raspi
Release Status Version
focal needs-triage -
jammy needs-triage -
noble needs-triage -
questing needs-triage -
upstream needs-triage -
linux-raspi2
Release Status Version
focal ignored replaced by linux-raspi
jammy DNE -
noble DNE -
questing DNE -
upstream ignored replaced by linux-raspi
linux-raspi-5.4
Release Status Version
bionic needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-raspi-realtime
Release Status Version
jammy DNE -
noble ignored superseded by Ubuntu Pro ppa version
questing DNE -
upstream needs-triage -
linux-realtime
Release Status Version
jammy ignored superseded by Ubuntu Pro ppa version
noble ignored superseded by Ubuntu Pro ppa version
questing needs-triage -
upstream needs-triage -
linux-realtime-6.8
Release Status Version
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-realtime-6.14
Release Status Version
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-riscv
Release Status Version
focal ignored superseded by linux-riscv-5.8
jammy ignored end of kernel support
noble ignored replaced by linux-riscv-6.14
questing needs-triage -
upstream needs-triage -
linux-riscv-5.8
Release Status Version
focal ignored superseded by linux-riscv-5.11
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-riscv-5.11
linux-riscv-5.11
Release Status Version
focal ignored superseded by linux-riscv-5.13
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-riscv-5.13
linux-riscv-5.15
Release Status Version
focal needs-triage -
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -
linux-riscv-5.19
Release Status Version
jammy ignored end of kernel support
noble DNE -
questing DNE -
upstream ignored end of life
linux-riscv-6.5
Release Status Version
jammy ignored superseded by linux-riscv-6.8
noble DNE -
questing DNE -
upstream ignored superseded by linux-riscv-6.8
linux-riscv-6.8
Release Status Version
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-riscv-6.14
Release Status Version
jammy DNE -
noble ignored superseded by linux-riscv-6.17
questing DNE -
upstream ignored superseded by linux-riscv-6.17
linux-riscv-6.17
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-starfive-5.19
Release Status Version
jammy ignored end of kernel support
noble DNE -
questing DNE -
upstream ignored end of life
linux-starfive-6.2
Release Status Version
jammy ignored superseded by linux-starfive-6.5
noble DNE -
questing DNE -
upstream ignored superseded by linux-starfive-6.5
linux-starfive-6.5
Release Status Version
jammy ignored end of kernel support
noble DNE -
questing DNE -
upstream ignored end of life
linux-xilinx
Release Status Version
jammy DNE -
noble needs-triage -
questing DNE -
upstream needs-triage -
linux-xilinx-zynqmp
Release Status Version
focal needs-triage -
jammy needs-triage -
noble DNE -
questing DNE -
upstream needs-triage -
linux-realtime-6.17
Release Status Version
jammy DNE -
noble DNE -
questing DNE -
upstream needs-triage -

Debian

linux
Release Status Fixed Version Urgency
bullseye vulnerable 5.10.223-1 -
bullseye (security) vulnerable 5.10.251-1 -
bookworm vulnerable 6.1.159-1 -
bookworm (security) vulnerable 6.1.164-1 -
trixie vulnerable 6.12.73-1 -
trixie (security) vulnerable 6.12.74-2 -
forky vulnerable 6.19.6-2 -
sid fixed 6.19.8-1 -
(unstable) fixed 6.19.8-1 -

SUSE

Severity: High
Product Status
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 Affected

Threat IntelligenceMISP

CISA Advisories
ICSA-26-295-16
Sources: CISA (public domain)

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-23272 ADVISORY https://ubuntu.com/security/notices/USN-8490-1 ADVISORY https://vuldb.com/?id.352026 REF https://cert-portal.siemens.com/productcert/html/ssa-784472.html REF https://git.kernel.org/stable/c/022effa9c54903858e443b1225370e6c758d03f6 REF https://git.kernel.org/stable/c/25841e8d4241c6c3763e70ae95050f8108707b46 REF https://git.kernel.org/stable/c/25fcaef7948912652905e96922f36583a84fffed REF https://git.kernel.org/stable/c/6826131c7674329335ca25df2550163eb8a1fd0c REF https://git.kernel.org/stable/c/86bc4b1a0f672d47ac19f9022432cb6a2e01cb33 REF https://git.kernel.org/stable/c/ccb8c8f3c1127cf34d18c737309897c68046bf21 REF https://git.kernel.org/stable/c/def602e498a4f951da95c95b1b8ce8ae68aa733a REF https://git.kernel.org/stable/c/e3ccb11fc8249759d23326038c8db987ddaabc77

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