x86/fpu: Stop relying on userspace for info to fault in xsave buffer (Linux Linux)

CVE-2024-26603
MEDIUM 5.5

En bref

Source
NVD
EPSS
EPSS 0.28 % · centile 20 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Stop relying on userspace for info to fault in xsave buffer Before this change, the expected size of the user space buffer was taken from fx_sw->xstate_size. fx_sw->xstate_size can be changed from user-space, so it is possible construct a sigreturn frame where: * fx_sw->xstate_size is smaller than the size required by valid bits in fx_sw->xfeatures. * user-space unmaps parts of the sigrame fpu buffer so that not all of the buffer required by xrstor is accessible. In this case, xrstor tries to restore and accesses the unmapped area which results in a fault. But fault_in_readable succeeds because buf + fx_sw->xstate_size is within the still mapped area, so it goes back and tries xrstor again. It will spin in this loop forever. Instead, fault in the maximum size which can be touched by XRSTOR (taken from fpstate->user_size). [ dhansen: tweak subject / changelog ]

Faiblesses (CWE)

  • CWE-835 — Boucle dont la condition de sortie est inatteignable (boucle infinie)

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 fcb3635f5018e53024c6be3c3213737f469f74ff < 8bd3eee7720c14b59a206bd05b98d7586bccf99a ; affected fcb3635f5018e53024c6be3c3213737f469f74ff < 627339cccdc9166792ecf96bc3c9f711a60ce996 ; affected fcb3635f5018e53024c6be3c3213737f469f74ff < b2479ab426cef7ab79a13005650eff956223ced2 ; affected fcb3635f5018e53024c6be3c3213737f469f74ff < 627e28cbb65564e55008315d9e02fbb90478beda ; affected fcb3635f5018e53024c6be3c3213737f469f74ff < d877550eaf2dc9090d782864c96939397a3c6835
Linux · Linuxaffected 5.14 ; unaffected 0 < 5.14 ; unaffected 5.15.150 ≤ 5.15.* ; unaffected 6.1.79 ≤ 6.1.* ; unaffected 6.6.18 ≤ 6.6.* ; unaffected 6.7.6 ≤ 6.7.*

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