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Linux CVE-2026-23410

| EUVDEUVD-2026-17841 HIGH
Race Condition (CWE-362)
2026-04-01 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
Red Hat
MEDIUM
qualitative

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-2026-17841
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 on rawdata dereference

There is a race condition that leads to a use-after-free situation: because the rawdata inodes are not refcounted, an attacker can start open()ing one of the rawdata files, and at the same time remove the last reference to this rawdata (by removing the corresponding profile, for example), which frees its struct aa_loaddata; as a result, when seq_rawdata_open() is reached, i_private is a dangling pointer and freed memory is accessed.

The rawdata inodes weren't refcounted to avoid a circular refcount and were supposed to be held by the profile rawdata reference. However during profile removal there is a window where the vfs and profile destruction race, resulting in the use after free.

Fix this by moving to a double refcount scheme. Where the profile refcount on rawdata is used to break the circular dependency. Allowing for freeing of the rawdata once all inode references to the rawdata are put.

AnalysisAI

Use-after-free in Linux kernel AppArmor allows local authenticated attackers to achieve high-impact code execution, privilege escalation, or denial of service via race condition on rawdata inode dereference. Affects kernel 4.13+ including current LTS branches. Patches available for 6.6.130, 6.12.77, 6.18.18, 6.19.8, and 7.0-rc4. EPSS score is low (0.02%) with no public exploit identified at time of analysis, but Ubuntu rated this priority=high affecting 729 releases.

Technical ContextAI

AppArmor is the Linux kernel's mandatory access control (MAC) framework providing application confinement. This vulnerability exists in the rawdata filesystem interface used to expose AppArmor policy binary data via /sys/kernel/security/apparmor. The issue stems from a reference counting design flaw where rawdata inode structures (struct aa_loaddata) lacked independent refcounts, relying solely on profile lifetime management. During concurrent operations-specifically when one thread opens a rawdata file via seq_rawdata_open() while another removes the associated AppArmor profile-a time-of-check-time-of-use (TOCTOU) race occurs. The profile removal destroys the aa_loaddata structure while the VFS layer still holds an i_private pointer to it, creating a classic use-after-free condition. The fix implements a double-refcount scheme where the profile maintains one reference and the inode operations maintain independent references, breaking the circular dependency while preventing premature deallocation. This is a memory safety vulnerability in kernel space affecting the security subsystem itself.

RemediationAI

Upgrade to patched kernel versions: 6.6.130 (LTS), 6.12.77 (LTS), 6.18.18, 6.19.8, or 7.0-rc4 and later. Upstream fixes are in commits 6ef1f2926c41 (6.6 stable), f9761add6d10 (6.12 stable), a0b7091c4de4 (6.18 stable), af782cc8871e (6.19 stable), and 763e838adc3c (mainline). Ubuntu users should apply USN-8152-1 via standard update mechanisms. If immediate patching is infeasible, restrict unprivileged user access to AppArmor profile manipulation interfaces by limiting membership in groups with CAP_MAC_ADMIN capability, though this does not eliminate risk from already-privileged local accounts. Consider disabling AppArmor rawdata exposure via /sys/kernel/security/apparmor if not required for operational tooling, though this breaks introspection tools like aa-status. Compensating controls have limited effectiveness since the vulnerability exists in core kernel code paths. Monitor for unusual AppArmor profile load/unload activity paired with rawdata file access patterns. Patch deployment is the only complete remediation.

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-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 6.19.8-1 -
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-2026-23410 vulnerability details – vuln.today

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