CVE-2025-38337jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata()
- 5.5MediumCVSS base score
- 0.20%Exploitation in 30 daysEPSS · top 90% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata() Since handle->h_transaction may be a NULL pointer, so we should change it to call is_handle_aborted(handle) first before dereferencing it. And the following data-race was reported in my fuzzer: ================================================================== BUG: KCSAN: data-race in jbd2_journal_dirty_metadata / jbd2_journal_dirty_metadata write to 0xffff888011024104 of 4 bytes by task 10881 on cpu 1: jbd2_journal_dirty_metadata+0x2a5/0x770 fs/jbd2/transaction.c:1556 __ext4_handle_dirty_metadata+0xe7/0x4b0 fs/ext4/ext4_jbd2.c:358 ext4_do_update_inode fs/ext4/inode.c:5220 [inline] ext4_mark_iloc_dirty+0x32c/0xd50 fs/ext4/inode.c:5869 __ext4_mark_inode_dirty+0xe1/0x450 fs/ext4/inode.c:6074 ext4_dirty_inode+0x98/0xc0 fs/ext4/inode.c:6103 .... read to 0xffff888011024104 of 4 bytes by task 10880 on cpu 0: jbd2_journal_dirty_metadata+0xf2/0x770 fs/jbd2/transaction.c:1512 __ext4_handle_dirty_metadata+0xe7/0x4b0 fs/ext4/ext4_jbd2.c:358 ext4_do_update_inode fs/ext4/inode.c:5220 [inline] ext4_mark_iloc_dirty+0x32c/0xd50 fs/ext4/inode.c:5869 __ext4_mark_inode_dirty+0xe1/0x450 fs/ext4/inode.c:6074 ext4_dirty_inode+0x98/0xc0 fs/ext4/inode.c:6103 .... value changed: 0x00000000 -> 0x00000001 ================================================================== This issue is caused by missing data-race annotation for jh->b_modified. Therefore, the missing annotation needs to be added.
Timeline
ID reserved
By Linux
- 3 months later
· 3 months later
Published
- 16 months later
· 16 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.20% · top 90% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 – < 5c1a34ff5b0bfdfd2f9343aa9b08d25df618bac5
- affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 – < ec669e5bf409f16e464bfad75f0ba039a45de29a
- affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 – < 43d5e3bb5f1dcd91e30238ea0b59a5f77063f84e
- affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 – < 23361b479f2700c00960d3ae9cdc8ededa762d47
- affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 – < 2e7c64d7a92c031d016f11c8e8cb05131ab7b75a
- affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 – < f78b38af3540b4875147b7b884ee11a27b3dbf4c
- affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 – < a377996d714afb8d4d5f4906336f78510039da29
- affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 – < af98b0157adf6504fade79b3e6cb260c4ff68e37
- affected 4.3
- unaffected < 4.3
- unaffected 5.4.295 – ≤ 5.4.*
- unaffected 5.10.239 – ≤ 5.10.*
- unaffected 5.15.186 – ≤ 5.15.*
- unaffected 6.1.142 – ≤ 6.1.*
- unaffected 6.6.95 – ≤ 6.6.*
- unaffected 6.12.35 – ≤ 6.12.*
- unaffected 6.15.4 – ≤ 6.15.*
- unaffected 6.16 – ≤ *
References
References10
- https://git.kernel.org/stable/c/5c1a34ff5b0bfdfd2f9343aa9b08d25df618bac5 (opens in a new tab)
- https://git.kernel.org/stable/c/ec669e5bf409f16e464bfad75f0ba039a45de29a (opens in a new tab)
- https://git.kernel.org/stable/c/43d5e3bb5f1dcd91e30238ea0b59a5f77063f84e (opens in a new tab)
- https://git.kernel.org/stable/c/23361b479f2700c00960d3ae9cdc8ededa762d47 (opens in a new tab)
- https://git.kernel.org/stable/c/2e7c64d7a92c031d016f11c8e8cb05131ab7b75a (opens in a new tab)
- https://git.kernel.org/stable/c/f78b38af3540b4875147b7b884ee11a27b3dbf4c (opens in a new tab)
- https://git.kernel.org/stable/c/a377996d714afb8d4d5f4906336f78510039da29 (opens in a new tab)
- https://git.kernel.org/stable/c/af98b0157adf6504fade79b3e6cb260c4ff68e37 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-20909 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-38337)Record last updated .