CVE-2025-39759

btrfs: qgroup: fix race between quota disable and quota rescan ioctl

HIGH 7.0

En bref

Source
NVD
EPSS
EPSS 0.12 % · 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: btrfs: qgroup: fix race between quota disable and quota rescan ioctl There's a race between a task disabling quotas and another running the rescan ioctl that can result in a use-after-free of qgroup records from the fs_info->qgroup_tree rbtree. This happens as follows: 1) Task A enters btrfs_ioctl_quota_rescan() -> btrfs_qgroup_rescan(); 2) Task B enters btrfs_quota_disable() and calls btrfs_qgroup_wait_for_completion(), which does nothing because at that point fs_info->qgroup_rescan_running is false (it wasn't set yet by task A); 3) Task B calls btrfs_free_qgroup_config() which starts freeing qgroups from fs_info->qgroup_tree without taking the lock fs_info->qgroup_lock; 4) Task A enters qgroup_rescan_zero_tracking() which starts iterating the fs_info->qgroup_tree tree while holding fs_info->qgroup_lock, but task B is freeing qgroup records from that tree without holding the lock, resulting in a use-after-free. Fix this by taking fs_info->qgroup_lock at btrfs_free_qgroup_config(). Also at btrfs_qgroup_rescan() don't start the rescan worker if quotas were already disabled.

Faiblesses (CWE)

  • CWE-362 — Situation de compétition

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.0CVSS:3.1/AV:L/AC:H/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 e685da14af6b31e4b336a110cb1bae1afc268be8 < 7cda0fdde5d9890976861421d207870500f9aace ; affected e685da14af6b31e4b336a110cb1bae1afc268be8 < b172535ccba12f0cf7d23b3b840989de47fc104d ; affected e685da14af6b31e4b336a110cb1bae1afc268be8 < dd0b28d877b293b1d7f8727a7de08ae36b6b9ef0 ; affected e685da14af6b31e4b336a110cb1bae1afc268be8 < c38028ce0d0045ca600b6a8345a0ff92bfb47b66 ; affected e685da14af6b31e4b336a110cb1bae1afc268be8 < 2fd0f5ceb997f90f4332ccbab6c7e907e6b2d0eb ; affected e685da14af6b31e4b336a110cb1bae1afc268be8 < e1249667750399a48cafcf5945761d39fa584edf
Linux · Linuxaffected 3.12 ; unaffected 0 < 3.12 ; unaffected 6.1.149 ≤ 6.1.* ; unaffected 6.6.103 ≤ 6.6.* ; unaffected 6.12.44 ≤ 6.12.* ; unaffected 6.15.11 ≤ 6.15.*

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