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Linux CVE-2026-23273

| EUVDEUVD-2026-13609 HIGH
Use After Free (CWE-416)
2026-03-20 Linux
7.8
CVSS 3.1 · Vendor: Linux
View

Attack ChainAIDerived

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

  1. Access
    Trigger macvlan_common_newlink() error path
  2. Exploit
    Device made visible before error detection
  3. Execution
    Call free_netdev() without RCU grace period
  4. Impact
    Use-after-free in macvlan_forward_source_one()

Vulnerability Assessment

Weakness
CWE
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.

Exploitation Conditions

Local attacker with low-privilege user access to Linux kernel via macvlan interface creation. Requires specific timing during macvlan_common_newlink() error path to trigger race condition. Victim interaction not needed; exploitation via crafted ip link commands.

Exploit ScenarioDerived

A local privileged user creates a macvlan interface that fails validation after becoming visible to RCU readers. The kernel frees the device structure immediately, causing use-after-free when concurrent forwarding code accesses it, leading to privilege escalation.

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 race condition exists in the Linux kernel's macvlan driver within the macvlan_common_newlink() error handling path. When a macvlan device creation fails after the network device becomes visible to the RCU (Read-Copy-Update) subsystem, the caller's subsequent free_netdev(dev) can race with ongoing packet forwarding operations, causing kernel memory corruption and potential information disclosure. This vulnerability affects Linux kernel versions 5.10 through 6.19 and later, and while no public exploit exists, the issue is reproducible via crafted netlink commands that trigger concurrent device creation and packet transmission.

Affected VersionsENISA

Linux 6.19
Linux patch: 6.12.75
Linux patch: 6.1.165
Linux 5dae6b36a7cb7a4fcf4121b95e9ca7f96f816c8a <3d94323c80d7fc4da5f10f9bb06a45d39d5d3cc4
Linux patch: 0
Linux cdedcd5aa3f3cb8b7ae0f87ab3a936d0bd583d66 <d34f7a8aa9a25b7e64e0e46e444697c0f702374d
Linux patch: 5.15.202
Linux c43d0e787cbba569ec9d11579ed370b50fab6c9c <721eb342d9ba19bad5c4815ea3921465158b7362
Linux patch: 5.10.252
Linux patch: 6.6.128
Linux patch: 7.0-rc1
Linux 986967a162142710076782d5b93daab93a892980 <a1f686d273d129b45712d95f4095843b864466bd
Linux da5c6b8ae47e414be47e5e04def15b25d5c962dc <91e4ff8d966978901630fc29582c1a76d3c6e46c
Linux f8db6475a83649689c087a8f52486fcc53e627e9 <1e58ae87ad1e6e24368dea9aec9048c758cd0e2b
Linux 11ba9f0dc865136174cb98834280fb21bbc950c7 <19c7d8ac51988d053709c1e85bd8482076af845d
Linux patch: 6.18.14
Linux f8db6475a83649689c087a8f52486fcc53e627e9 <e3f000f0dee1bfab52e2e61ca6a3835d9e187e35
Linux patch: 6.19.4

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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  • Exploit and PoC references, threat intelligence from 22 sources

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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:

macvlan: observe an RCU grace period in macvlan_common_newlink() error path

valis reported that a race condition still happens after my prior patch.

macvlan_common_newlink() might have made @dev visible before detecting an error, and its caller will directly call free_netdev(dev).

We must respect an RCU period, either in macvlan or the core networking stack.

After adding a temporary mdelay(1000) in macvlan_forward_source_one() to open the race window, valis repro was:

ip link add p1 type veth peer p2 ip link set address 00:00:00:00:00:20 dev p1 ip link set up dev p1 ip link set up dev p2 ip link add mv0 link p2 type macvlan mode source

(ip link add invalid% link p2 type macvlan mode source macaddr add 00:00:00:00:00:20 &) ; sleep 0.5 ; ping -c1 -I p1 1.2.3.4 PING 1.2.3.4 (1.2.3.4): 56 data bytes RTNETLINK answers: Invalid argument

BUG: KASAN: slab-use-after-free in macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444) Read of size 8 at addr ffff888016bb89c0 by task e/175

CPU: 1 UID: 1000 PID: 175 Comm: e Not tainted 6.19.0-rc8+ #33 NONE Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014 Call Trace: <IRQ> dump_stack_lvl (lib/dump_stack.c:123) print_report (mm/kasan/report.c:379 mm/kasan/report.c:482) ? macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444) kasan_report (mm/kasan/report.c:597) ? macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444) macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444) ? tasklet_init (kernel/softirq.c:983) macvlan_handle_frame (drivers/net/macvlan.c:501)

Allocated by task 169: kasan_save_stack (mm/kasan/common.c:58) kasan_save_track (./arch/x86/include/asm/current.h:25 mm/kasan/common.c:70 mm/kasan/common.c:79) __kasan_kmalloc (mm/kasan/common.c:419) __kvmalloc_node_noprof (./include/linux/kasan.h:263 mm/slub.c:5657 mm/slub.c:7140) alloc_netdev_mqs (net/core/dev.c:12012) rtnl_create_link (net/core/rtnetlink.c:3648) rtnl_newlink (net/core/rtnetlink.c:3830 net/core/rtnetlink.c:3957 net/core/rtnetlink.c:4072) rtnetlink_rcv_msg (net/core/rtnetlink.c:6958) netlink_rcv_skb (net/netlink/af_netlink.c:2550) netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344) netlink_sendmsg (net/netlink/af_netlink.c:1894) __sys_sendto (net/socket.c:727 net/socket.c:742 net/socket.c:2206) __x64_sys_sendto (net/socket.c:2209) do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:131)

Freed by task 169: kasan_save_stack (mm/kasan/common.c:58) kasan_save_track (./arch/x86/include/asm/current.h:25 mm/kasan/common.c:70 mm/kasan/common.c:79) kasan_save_free_info (mm/kasan/generic.c:587) __kasan_slab_free (mm/kasan/common.c:287) kfree (mm/slub.c:6674 mm/slub.c:6882) rtnl_newlink (net/core/rtnetlink.c:3845 net/core/rtnetlink.c:3957 net/core/rtnetlink.c:4072) rtnetlink_rcv_msg (net/core/rtnetlink.c:6958) netlink_rcv_skb (net/netlink/af_netlink.c:2550) netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344) netlink_sendmsg (net/netlink/af_netlink.c:1894) __sys_sendto (net/socket.c:727 net/socket.c:742 net/socket.c:2206) __x64_sys_sendto (net/socket.c:2209) do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:131)

Threat Intelligence Overview

EPSS Score
0.0%
Top 94% exploitable
Threat Intel
3
1 source
Data Quality
7 sources
Confidence: High

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

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

Vendor StatusVendor

Ubuntu

Priority: Medium
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linux-gke-4.15
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bionic ignored superseded by linux-gke-5.0
jammy DNE -
noble DNE -
questing DNE -
upstream ignored superseded by linux-gke-5.0
linux-gke-5.4
Release Status Version
bionic ignored end of kernel support
jammy DNE -
noble DNE -
questing DNE -
upstream ignored end of life
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 fixed 6.19.6-2 -
sid fixed 6.19.8-1 -
(unstable) fixed 6.18.14-1 -

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

Threat IntelligenceMISP

Sources: CISA (public domain)

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