CyberSecBulletin
CVE-2026-23269NVD status: Analyzed

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-23269 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions f43eea8ae0102ea198da211ef7f5ce83725ecf19, 5487871b2b56c19d26936ed6fdc62652b30941df, 5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.15% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to f43eea8ae0102ea198da211ef7f5ce83725ecf19 or 5487871b2b56c19d26936ed6fdc62652b30941df or 5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a or 07cf6320f40ea2ccfad63728cff34ecb309d03da, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.253 or 5.15.203 or 6.1.169 or 6.6.130, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxad5ff3db53c68c2f12936bc74ea5dfe0af943592 up to, but not including, f43eea8ae0102ea198da211ef7f5ce83725ecf19; ad5ff3db53c68c2f12936bc74ea5dfe0af943592 up to, but not including, 5487871b2b56c19d26936ed6fdc62652b30941df; ad5ff3db53c68c2f12936bc74ea5dfe0af943592 up to, but not including, 5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a; ad5ff3db53c68c2f12936bc74ea5dfe0af943592 up to, but not including, 07cf6320f40ea2ccfad63728cff34ecb309d03da; ad5ff3db53c68c2f12936bc74ea5dfe0af943592 up to, but not including, 15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c; ad5ff3db53c68c2f12936bc74ea5dfe0af943592 up to, but not including, 0baadb0eece2c4d939db10d3c323b4652ac79a58; ad5ff3db53c68c2f12936bc74ea5dfe0af943592 up to, but not including, 3bb7db43e32190c973d4019037cedb7895920184; ad5ff3db53c68c2f12936bc74ea5dfe0af943592 up to, but not including, 9063d7e2615f4a7ab321de6b520e23d370e58816; and 1 more rangesf43eea8ae0102ea198da211ef7f5ce83725ecf19, 5487871b2b56c19d26936ed6fdc62652b30941df, 5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a, 07cf6320f40ea2ccfad63728cff34ecb309d03da, 15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c, 0baadb0eece2c4d939db10d3c323b4652ac79a58
LinuxLinux Kernel3.4 up to, but not including, 5.10.253; 5.11 up to, but not including, 5.15.203; 5.16 up to, but not including, 6.1.169; 6.2 up to, but not including, 6.6.130; 6.7 up to, but not including, 6.12.77; 6.13 up to, but not including, 6.18.18; 6.19 up to, but not including, 6.19.8; 7.05.10.253, 5.15.203, 6.1.169, 6.6.130, 6.12.77, 6.18.18

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by CNA.

Official description

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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Recent Out-of-bounds Read vulnerabilities

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