ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY (Linux Linux)

CVE-2026-31597
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.13 % · centile 2 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY filemap_fault() may drop the mmap_lock before returning VM_FAULT_RETRY, as documented in mm/filemap.c: "If our return value has VM_FAULT_RETRY set, it's because the mmap_lock may be dropped before doing I/O or by lock_folio_maybe_drop_mmap()." When this happens, a concurrent munmap() can call remove_vma() and free the vm_area_struct via RCU. The saved 'vma' pointer in ocfs2_fault() then becomes a dangling pointer, and the subsequent trace_ocfs2_fault() call dereferences it -- a use-after-free. Fix this by saving ip_blkno as a plain integer before calling filemap_fault(), and removing vma from the trace event. Since ip_blkno is copied by value before the lock can be dropped, it remains valid regardless of what happens to the vma or inode afterward.

Faiblesses (CWE)

  • CWE-416 — Utilisation après libération

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 614a9e849ca6ea24843795251cb30af525d5336b < 36539c4d536f851a3b346a6ebb27b51bc3d77a94 ; affected 614a9e849ca6ea24843795251cb30af525d5336b < 35c2c05261d6f6d84aaa1355afa201d507943e76 ; affected 614a9e849ca6ea24843795251cb30af525d5336b < 3f5e74b5db9353b01ed50f4de84e75b755f8fbc2 ; affected 614a9e849ca6ea24843795251cb30af525d5336b < 6f072daefcab1d84ce37c073645615f63be91006 ; affected 614a9e849ca6ea24843795251cb30af525d5336b < 4cf2768a0291a0cdd0dae801ea0eafa3878a349d ; affected 614a9e849ca6ea24843795251cb30af525d5336b < d45ff441b416d4aa1af72b1db23d959601c04da2
Linux · Linuxaffected 2.6.39 ; unaffected 0 < 2.6.39 ; 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