apparmor: avoid per-cpu hold underflow in aa_get_buffer (Linux Linux)

CVE-2026-45884
MEDIUM 5.5

En bref

Source
NVD
EPSS
EPSS 0.16 % · centile 5 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Analyzed

Description

In the Linux kernel, the following vulnerability has been resolved: apparmor: avoid per-cpu hold underflow in aa_get_buffer When aa_get_buffer() pulls from the per-cpu list it unconditionally decrements cache->hold. If hold reaches 0 while count is still non-zero, the unsigned decrement wraps to UINT_MAX. This keeps hold non-zero for a very long time, so aa_put_buffer() never returns buffers to the global list, which can starve other CPUs and force repeated kmalloc(aa_g_path_max) allocations. Guard the decrement so hold never underflows.

Faiblesses (CWE)

  • CWE-191 — Soupassement d'entier

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected ea9bae12d02819556db63348db8bd8441eb316f2 < 202824a1f89a9786c20a3d646a7c88d223abb1b2 ; affected ea9bae12d02819556db63348db8bd8441eb316f2 < 80c334acc6d0bee8605a358a33e69b4aea1ffb92 ; affected ea9bae12d02819556db63348db8bd8441eb316f2 < 4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169 ; affected ea9bae12d02819556db63348db8bd8441eb316f2 < 640cf2f09575c9dc344b3f7be2498d31e3923ead
Linux · Linuxaffected 6.7 ; unaffected 0 < 6.7 ; unaffected 6.12.75 ≤ 6.12.* ; unaffected 6.18.14 ≤ 6.18.* ; unaffected 6.19.4 ≤ 6.19.* ; unaffected 7.0 ≤ *

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD