riscv: Fix register corruption from uninitialized cregs on error (Linux Linux)

CVE-2026-64082
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.13 % · centile 3 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Analyzed

Description

In the Linux kernel, the following vulnerability has been resolved: riscv: Fix register corruption from uninitialized cregs on error compat_riscv_gpr_set() calls cregs_to_regs() unconditionally, even when user_regset_copyin() fails. Since cregs is an uninitialized stack variable, a copyin failure causes uninitialized stack data to be written into the target task's pt_regs, corrupting its register state and potentially leaking kernel stack contents. compat_restore_sigcontext() has the same issue: it calls cregs_to_regs() even when __copy_from_user() fails, leading to the same corruption of the signal-returning task's register state on error. Only call cregs_to_regs() when the user copy succeeds.

Faiblesses (CWE)

  • CWE-908 — Utilisation d'une ressource non initialisée

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:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/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 7383ee05314be58f8f9f018ee0ac53bef3808aea < f2d88b0d7aebfa4643fc58bbae57210c6daff9c6 ; affected 7383ee05314be58f8f9f018ee0ac53bef3808aea < 66dedb6028c3df6c6a3372dd935b823917e150d5 ; affected 7383ee05314be58f8f9f018ee0ac53bef3808aea < 2a7d1daf2674fe7d5b1cc99a4e3b5f0f72d5958f ; affected 7383ee05314be58f8f9f018ee0ac53bef3808aea < 0599aa23734c48de9bce36d043a9ec90c23945a1 ; affected 7383ee05314be58f8f9f018ee0ac53bef3808aea < 9e020156833f1ad0d425a1e3d85b65639f1c1c50 ; affected 7383ee05314be58f8f9f018ee0ac53bef3808aea < 6ebcbb53fc9bc30843054ed99fd60b8e542628f4
Linux · Linuxaffected 5.19 ; unaffected 0 < 5.19 ; unaffected 6.1.187 ≤ 6.1.* ; unaffected 6.6.156 ≤ 6.6.* ; unaffected 6.12.108 ≤ 6.12.* ; unaffected 6.18.49 ≤ 6.18.*

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