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Linux CVE-2026-23411

| EUVDEUVD-2026-17843 HIGH
Race Condition (CWE-362)
2026-04-01 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-4g4x-f3f9-gpq4
7.8
CVSS 3.1 · NVD
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Severity by source

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

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

6
Analysis Updated
Apr 18, 2026 - 09:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 18, 2026 - 09:22 vuln.today
cvss_changed
Patch released
Apr 01, 2026 - 14:30 nvd
Patch available
EUVD ID Assigned
Apr 01, 2026 - 09:22 euvd
EUVD-2026-17843
Analysis Generated
Apr 01, 2026 - 09:22 vuln.today
CVE Published
Apr 01, 2026 - 09:16 nvd
HIGH 7.8

DescriptionCVE.org

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

apparmor: fix race between freeing data and fs accessing it

AppArmor was putting the reference to i_private data on its end after removing the original entry from the file system. However the inode can aand does live beyond that point and it is possible that some of the fs call back functions will be invoked after the reference has been put, which results in a race between freeing the data and accessing it through the fs.

While the rawdata/loaddata is the most likely candidate to fail the race, as it has the fewest references. If properly crafted it might be possible to trigger a race for the other types stored in i_private.

Fix this by moving the put of i_private referenced data to the correct place which is during inode eviction.

AnalysisAI

Use-after-free in Linux kernel AppArmor allows local authenticated users to achieve high confidentiality, integrity, and availability impact through a race condition between inode eviction and filesystem callbacks. The vulnerability stems from premature reference release of i_private data before inode cleanup completes. Patch available from kernel.org stable branches affecting Linux 4.13+ with Ubuntu marking priority=high across 729 releases. EPSS score of 0.02% suggests limited observed exploitation attempts despite widespread kernel deployment.

Technical ContextAI

AppArmor is Linux's mandatory access control (MAC) framework that confines programs based on security profiles stored in securityfs. The vulnerability exists in AppArmor's filesystem interface code where inode structures (VFS layer objects representing filesystem entries) contain i_private pointers to AppArmor policy data like rawdata/loaddata. The kernel's two-phase inode lifecycle involves removal from the filesystem namespace followed by asynchronous eviction when the last reference is dropped. AppArmor incorrectly released i_private references during the removal phase rather than the eviction phase (via the inode evict callback). This creates a temporal window where filesystem operations (read, write, close callbacks) can still access freed memory if the inode remains referenced elsewhere in the kernel. The race manifests as a classic use-after-free: one CPU path frees the AppArmor policy data while another CPU dereferences the dangling pointer through a filesystem callback. While rawdata/loaddata paths are most vulnerable due to fewer reference counts, all i_private stored objects (policy namespaces, profiles) are theoretically exploitable with precise timing. The fix moves put operations into the evict_inode callback ensuring references survive until all filesystem operations complete.

RemediationAI

Upgrade to patched Linux kernel versions: 6.6.130+ (LTS), 6.12.77+ (stable), 6.18.18+ (stable), 6.19.8+ (stable), or 7.0-rc4+ (mainline). Ubuntu users should apply updates per USN-8152-1 advisory at https://ubuntu.com/security/notices/USN-8152-1 through standard apt upgrade procedures. Debian users should monitor security tracker for release-specific patches. For systems unable to immediately patch, compensating controls include: (1) Restrict access to /sys/kernel/security/apparmor to root-only by verifying securityfs mount permissions, preventing unprivileged users from triggering vulnerable code paths-note this may break legitimate AppArmor policy management tools requiring user-space access; (2) Disable AppArmor entirely via kernel parameter apparmor=0 if MAC enforcement is not operationally required, though this removes security confinement benefits and is unsuitable for production systems relying on mandatory access control; (3) Enable kernel address space layout randomization (KASLR) and Supervisor Mode Access Prevention (SMAP) if not already active to increase exploitation difficulty, though these are probabilistic mitigations not preventing the race itself. Patches modify AppArmor's inode operations to defer i_private reference release until evict_inode callback execution, eliminating the race window without functionality changes or performance overhead. No reboot-less live patching confirmed; kernel restart required to activate fixes.

Vendor StatusVendor

Ubuntu

Priority: High
linux
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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-riscv-5.11
Release Status Version
noble DNE -
focal ignored superseded by linux-riscv-5.13
jammy DNE -
questing DNE -
upstream ignored superseded by linux-riscv-5.13
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-5.15
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 6.19.8-1 -
sid fixed 6.19.10-1 -
(unstable) fixed 6.19.6-2 -

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
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

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CVE-2026-23411 vulnerability details – vuln.today

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