CVE-2026-23410

Local privilege escalation via rawdata refcount race

Published Apr 1, 2026 · Updated Apr 1, 2026

Use-after-free in AppArmor rawdata handling in Linux Kernel allows local users to gain kernel privileges through a profile-removal race. Rawdata inodes lack independent references, so concurrent file opening and profile removal free aa_loaddata before seq_rawdata_open dereferences i_private. Low-privilege access through unprivileged user namespaces is sufficient; successful exploitation exposes or modifies kernel memory, while failed attempts can panic the host.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in AppArmor rawdata handling in Linux Kernel allows local users to gain kernel privileges through a profile-removal race. Rawdata inodes lack independent references, so concurrent file opening and profile removal free aa_loaddata before seq_rawdata_open dereferences i_private. Low-privilege access through unprivileged user namespaces is sufficient; successful exploitation exposes or modifies kernel memory, while failed attempts can panic the host.

The record

CVE
CVE-2026-23410
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-362, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.13
  2. Affected versionversion=5d5182cae40115c03933989473288e54afb39c7c <6ef1f2926c41ab96952d9696d55a052f1b3a9418
  3. Affected versionversion=5d5182cae40115c03933989473288e54afb39c7c <763e838adc3c7ec5a7df2990ce84cad951e42721
  4. Affected versionversion=5d5182cae40115c03933989473288e54afb39c7c <a0b7091c4de45a7325c8780e6934a894f92ac86b
  5. Affected versionversion=5d5182cae40115c03933989473288e54afb39c7c <af782cc8871e3683ddd5a3cd2f7df526599863a9
  6. Affected versionversion=5d5182cae40115c03933989473288e54afb39c7c <f9761add6d100962a23996cb68f3d6abdd4d1815

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.13; version=5d5182cae40115c03933989473288e54afb39c7c <6ef1f2926c41ab96952d9696d55a052f1b3a9418; version=5d5182cae40115c03933989473288e54afb39c7c <763e838adc3c7ec5a7df2990ce84cad951e42721; version=5d5182cae40115c03933989473288e54afb39c7c <a0b7091c4de45a7325c8780e6934a894f92ac86b; version=5d5182cae40115c03933989473288e54afb39c7c <af782cc8871e3683ddd5a3cd2f7df526599863a9; version=5d5182cae40115c03933989473288e54afb39c7c <f9761add6d100962a23996cb68f3d6abdd4d1815

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo