7.8

CVE-2025-40233: linux

CVSS: 7.8v3.1HighDeferred
AliasesUBUNTU-CVE-2025-40233DEBIAN-CVE-2025-40233
Published 04-12-2025Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2025-40233 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4.2% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.15%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 50 · Related 49
DLA-4404-1OPENSUSE-SU-2026:20145-1SUSE-SU-2026:0263-1SUSE-SU-2026:0278-1SUSE-SU-2026:0281-1SUSE-SU-2026:0293-1

Timeline

  1. 04-12-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags.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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

0.00 pp

From 0.15% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.15%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu153 products
  • linuxAll versions (No fix recorded) | < 5.15.0-170.180 | < 6.8.0-106.106 | < 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1100.107 | < 6.8.0-1050.53 | < 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.158-1 | < 6.12.57-1 | < 6.17.6-1
Linux1 product
  • linux≥ 53069d4e76954e2e63c1b3c501051c6fbcf7298c, < 93166bc53c0e3587058327a4121daea34b4fecd5 | ≥ 53069d4e76954e2e63c1b3c501051c6fbcf7298c, < a7ee72286efba1d407c6f15a0528e43593fb7007 | ≥ 53069d4e76954e2e63c1b3c501051c6fbcf7298c, < 93b1ab422f1966b71561158e1aedce4ec100f357 | ≥ 53069d4e76954e2e63c1b3c501051c6fbcf7298c, < e92af7737a94a729225d2a5d180eaaa77fe0bbc1 | ≥ 53069d4e76954e2e63c1b3c501051c6fbcf7298c, < aa6a21409dd6221bb268b56bb410e031c632ff9a | ≥ 53069d4e76954e2e63c1b3c501051c6fbcf7298c, < bb69928ed578f881e68d26aaf1a8f6e7faab3b44 | ≥ 53069d4e76954e2e63c1b3c501051c6fbcf7298c, < a21750df2f6169af6e039a3bb4893d6c9564e48d | ≥ 53069d4e76954e2e63c1b3c501051c6fbcf7298c, < 78a63493f8e352296dbc7cb7b3f4973105e8679e | 3.0

3 vendors · 155 products

References

41 links
Show all 41 references