rxrpc: Fix missing validation of ticket length in non-XDR key preparsing (Linux Linux)

CVE-2026-31696
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.14 % · centile 3 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix missing validation of ticket length in non-XDR key preparsing In rxrpc_preparse(), there are two paths for parsing key payloads: the XDR path (for large payloads) and the non-XDR path (for payloads <= 28 bytes). While the XDR path (rxrpc_preparse_xdr_rxkad()) correctly validates the ticket length against AFSTOKEN_RK_TIX_MAX, the non-XDR path fails to do so. This allows an unprivileged user to provide a very large ticket length. When this key is later read via rxrpc_read(), the total token size (toksize) calculation results in a value that exceeds AFSTOKEN_LENGTH_MAX, triggering a WARN_ON(). [ 2001.302904] WARNING: CPU: 2 PID: 2108 at net/rxrpc/key.c:778 rxrpc_read+0x109/0x5c0 [rxrpc] Fix this by adding a check in the non-XDR parsing path of rxrpc_preparse() to ensure the ticket length does not exceed AFSTOKEN_RK_TIX_MAX, bringing it into parity with the XDR parsing logic.

Faiblesses (CWE)

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 < 44714dfda386884919ba366411880b6fb3c3efd3 ; affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 < 41a117dd80371343babc52198d1114e83eb37627 ; affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 < 9a397aa9b5e53ca63d4d6aefb542832eca389618 ; affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 < 1fa36cf495b0023e8475d038535c05e4063211e1 ; affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 < 4458757c020592a3094366e0fb20457383b42f92 ; affected 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 < ce383ba615339f8eaec646a166d2c2b015bb5ca0
Linux · Linuxaffected 3.17 ; unaffected 0 < 3.17 ; unaffected 5.10.258 ≤ 5.10.* ; unaffected 5.15.209 ≤ 5.15.* ; unaffected 6.1.175 ≤ 6.1.* ; unaffected 6.6.136 ≤ 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