CVE-2025-40233

ocfs2: clear extent cache after moving/defragmenting extents

At a glance

Severity
HIGH 7.8
EPSS
EPSS 0.15 % · percentile 5 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Deferred

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: clear extent cache after moving/defragmenting extents The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags. This triggers a BUG_ON in ocfs2_refcount_cal_cow_clusters(). The problem occurs when: 1. copy_file_range() creates a reflinked extent with OCFS2_EXT_REFCOUNTED 2. ioctl(FITRIM) triggers ocfs2_move_extents() 3. __ocfs2_move_extents_range() reads and caches the extent (flags=0x2) 4. ocfs2_move_extent()/ocfs2_defrag_extent() calls __ocfs2_move_extent() which clears OCFS2_EXT_REFCOUNTED flag on disk (flags=0x0) 5. The extent map cache is not invalidated after the move 6. Later write() operations read stale cached flags (0x2) but disk has updated flags (0x0), causing a mismatch 7. BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) triggers Fix by clearing the extent map cache after each extent move/defrag operation in __ocfs2_move_extents_range(). This ensures subsequent operations read fresh extent data from disk.

Scores

VersionScoreVectorScored by
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)

European references

CERT-FR advisories

Affected products

ProductVersions
Linux · Linuxaffected 53069d4e76954e2e63c1b3c501051c6fbcf7298c < 93166bc53c0e3587058327a4121daea34b4fecd5 ; affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c < a7ee72286efba1d407c6f15a0528e43593fb7007 ; affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c < 93b1ab422f1966b71561158e1aedce4ec100f357 ; affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c < e92af7737a94a729225d2a5d180eaaa77fe0bbc1 ; affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c < aa6a21409dd6221bb268b56bb410e031c632ff9a ; affected 53069d4e76954e2e63c1b3c501051c6fbcf7298c < bb69928ed578f881e68d26aaf1a8f6e7faab3b44
Linux · Linuxaffected 3.0 ; unaffected 0 < 3.0 ; unaffected 5.4.301 ≤ 5.4.* ; unaffected 5.10.246 ≤ 5.10.* ; unaffected 5.15.196 ≤ 5.15.* ; unaffected 6.1.158 ≤ 6.1.*

References

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