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Linux CVE-2026-23269

| EUVDEUVD-2026-12912 HIGH
Out-of-bounds Read (CWE-125)
2026-03-18 Linux
7.1
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.1 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Ubuntu
MEDIUM
qualitative
SUSE
HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

Lifecycle Timeline

6
Analysis Updated
Apr 18, 2026 - 09:41 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 18, 2026 - 09:22 vuln.today
cvss_changed
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 18, 2026 - 18:15 euvd
EUVD-2026-12912
Analysis Generated
Mar 18, 2026 - 18:15 vuln.today
CVE Published
Mar 18, 2026 - 17:54 nvd
HIGH 7.1

DescriptionCVE.org

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

apparmor: validate DFA start states are in bounds in unpack_pdb

Start states are read from untrusted data and used as indexes into the DFA state tables. The aa_dfa_next() function call in unpack_pdb() will access dfa->tables[YYTD_ID_BASE][start], and if the start state exceeds the number of states in the DFA, this results in an out-of-bound read.

============== BUG: KASAN: slab-out-of-bounds in aa_dfa_next+0x2a1/0x360 Read of size 4 at addr ffff88811956fb90 by task su/1097 ...

Reject policies with out-of-bounds start states during unpacking to prevent the issue.

AnalysisAI

Out-of-bounds read in Linux kernel's AppArmor subsystem allows local authenticated attackers to disclose kernel memory and potentially crash the system via maliciously crafted security policies. Affects Linux kernels from 3.4 onwards with patches released for stable branches 6.12.77, 6.18.18, 6.19.8, and 7.0-rc4. No active exploitation confirmed (not in CISA KEV), EPSS probability low at 0.02%, but Ubuntu rates priority as medium with patches deployed across 729 releases. Requires local access with low privileges (PR:L) and ability to load AppArmor policies.

Technical ContextAI

AppArmor is Linux's Mandatory Access Control (MAC) framework that uses Deterministic Finite Automata (DFA) to enforce security policies. The vulnerability resides in the policy unpacking code (unpack_pdb function) which validates and loads compiled policy databases. When AppArmor parses untrusted policy files, it reads DFA start state values directly from the policy data and uses them as array indices into dfa->tables[YYTD_ID_BASE][start] via aa_dfa_next(). Because start state values are not bounds-checked against the actual DFA state table size before dereferencing, an attacker-controlled start state exceeding the table bounds triggers a slab-out-of-bounds read detected by KASAN. This is a classic integer-as-array-index vulnerability where external input directly controls memory access patterns without validation. The affected code path is triggered during policy load operations, which typically require CAP_MAC_ADMIN capability or equivalent AppArmor management permissions.

RemediationAI

Upgrade to patched Linux kernel versions: 6.12.77+ for 6.12.x branch, 6.18.18+ for 6.18.x branch, 6.19.8+ for 6.19.x branch, or 7.0-rc4+ for mainline. Ubuntu users apply updates via USN-8141-1. SUSE users apply relevant SUSE-SU-2026 updates matching their kernel branch. Debian users follow security tracker guidance for their release. Patch commits available at kernel.org stable tree URLs provided in references. For systems where immediate patching is not feasible, implement compensating controls: restrict AppArmor policy loading to root-only by auditing and removing CAP_MAC_ADMIN from untrusted users or containers; monitor policy load operations via auditd rules for aa_replace_profiles and aa_load_policy syscalls; consider temporarily disabling AppArmor (apparmor=0 kernel parameter) only if organizational risk assessment determines the MAC framework provides less value than exposure to this vulnerability - note this significantly weakens system security posture and should be temporary. On containerized platforms, ensure container runtimes do not grant CAP_MAC_ADMIN to workloads. Validate that existing AppArmor policies were loaded from trusted sources and integrity-protected policy files. These mitigations reduce but do not eliminate risk - patching remains the definitive solution.

Vendor StatusVendor

Ubuntu

Priority: Medium
linux
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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 fixed 5.10.251-1 -
bullseye (security) fixed 5.10.251-1 -
bookworm fixed 6.1.164-1 -
bookworm (security) fixed 6.1.164-1 -
trixie fixed 6.12.74-2 -
trixie (security) fixed 6.12.74-2 -
forky fixed 6.19.6-2 -
sid fixed 6.19.8-1 -
(unstable) fixed 6.19.6-2 -

SUSE

Severity: High
Product Status
Container suse/sle-micro/base-5.5:2.0.4-5.8.254 Affected
Container suse/sle-micro/kvm-5.5:2.0.4-3.5.489 Affected
Container suse/sle-micro/rt-5.5:latest Affected
Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-EC2 Affected

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CVE-2026-23269 vulnerability details – vuln.today

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