CVE-2024-394639p: add missing locking around taking dentry fid list
- 7.8HighCVSS base score
- 0.25%Exploitation in 30 daysEPSS · top 83% 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: 9p: add missing locking around taking dentry fid list Fix a use-after-free on dentry's d_fsdata fid list when a thread looks up a fid through dentry while another thread unlinks it: UAF thread: refcount_t: addition on 0; use-after-free. p9_fid_get linux/./include/net/9p/client.h:262 v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129 v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181 v9fs_fid_lookup+0xbf/0xc20 linux/fs/9p/fid.c:314 v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400 vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248 Freed by: p9_fid_destroy (inlined) p9_client_clunk+0xb0/0xe0 linux/net/9p/client.c:1456 p9_fid_put linux/./include/net/9p/client.h:278 v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55 v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518 vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335 The problem is that d_fsdata was not accessed under d_lock, because d_release() normally is only called once the dentry is otherwise no longer accessible but since we also call it explicitly in v9fs_remove that lock is required: move the hlist out of the dentry under lock then unref its fids once they are no longer accessible.
Timeline
ID reserved
By Linux
Published
- 2 years later
· 2 years 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 |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| CISA-ADPADP (enrichment) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.25% · top 83% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 154372e67d4053e56591245eb413686621941333 – < 3bb6763a8319170c2d41c4232c8e7e4c37dcacfb
- affected 154372e67d4053e56591245eb413686621941333 – < cb299cdba09f46f090b843d78ba26b667d50a456
- affected 154372e67d4053e56591245eb413686621941333 – < f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5
- affected 154372e67d4053e56591245eb413686621941333 – < fe17ebf22feb4ad7094d597526d558a49aac92b4
- affected 154372e67d4053e56591245eb413686621941333 – < c898afdc15645efb555acb6d85b484eb40a45409
- affected 5.11
- unaffected < 5.11
- unaffected 5.15.168 – ≤ 5.15.*
- unaffected 6.1.94 – ≤ 6.1.*
- unaffected 6.6.34 – ≤ 6.6.*
- unaffected 6.9.5 – ≤ 6.9.*
- unaffected 6.10 – ≤ *
References
References6
- https://git.kernel.org/stable/c/3bb6763a8319170c2d41c4232c8e7e4c37dcacfb (opens in a new tab)
- https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409 (opens in a new tab)x_transferred
- https://www.zerodayinitiative.com/advisories/ZDI-24-1194/ (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-2024-37988 (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-2024-39463)Record last updated .