batman-adv: fix fragment reassembly length accounting (Linux Linux)

CVE-2026-52914
CRITICAL 9.8

En bref

Source
NVD
EPSS
EPSS 0.63 % · centile 50 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix fragment reassembly length accounting batman-adv keeps a running payload length for queued fragments and uses it to validate a fragment chain before reassembly. That accounting currently allows the accumulated fragment length to be truncated during updates. As a result, malformed fragment chains can bypass the intended validation and drive reassembly with inconsistent length state, leading to a local denial of service. Fix the accounting by storing the accumulated length in a length-typed field and rejecting update overflows before the existing validation logic runs. The fix was verified against the original reproducer and against valid fragment reassembly paths.

Faiblesses (CWE)

  • CWE-190 — Débordement d'entier
  • CWE-787 — Écriture hors limites

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1CRITICAL 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1CRITICAL 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 610bfc6bc99bc83680d190ebc69359a05fc7f605 < e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64 ; affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 < 37be61825b15534a16ff9cfc9546de155b6df982 ; affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 < 975563c5de1123dde1ec7946bf5556d20c89d74e ; affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 < f653b040dad1af70fa5cd4fe085e4758925480c9 ; affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 < e910dbf509125fe51ad68e4fa74dc8ab0a8e787a ; affected 610bfc6bc99bc83680d190ebc69359a05fc7f605 < 3eb8bcb823391bd58997831b3c9c152a4ba8e255
Linux · Linuxaffected 3.13 ; unaffected 0 < 3.13 ; unaffected 5.10.258 ≤ 5.10.* ; unaffected 5.15.209 ≤ 5.15.* ; unaffected 6.1.175 ≤ 6.1.* ; unaffected 6.6.142 ≤ 6.6.*

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