- 9.8CriticalCVSS base score
- 0.48%Exploitation in 30 daysEPSS · top 58% 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: ksmbd: serialize QUERY_DIRECTORY requests per file smb2_query_dir() stores a pointer to its stack-allocated private data in the ksmbd_file readdir_data. Concurrent QUERY_DIRECTORY requests using the same file handle can overwrite this pointer while an iterate_dir() callback is still using it, resulting in a stack use-after-free. Add a per-file mutex and hold it while accessing the shared directory enumeration state. The lock covers scan restart, dot entry state, readdir_data setup and iteration, and response construction. This prevents another request from replacing readdir_data.private before the current request has finished using it and also serializes the shared file position.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 23 days later
· 23 days 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 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.48% · top 58% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 1426fd79102539bc0ab5c8fced047ad4313b9908
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 2a64dbf9c739ddf7a25a066507597bf89f8f73d2
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 64dac2d486ec1eb18dc00968b16a230b6b75ec24
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < fd22b039a5a05bc1d6818e9dcd1001fb432a829d
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < be6d26bf27499977c746abc163659915082348d8
- affected 5.15
- unaffected < 5.15
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/1426fd79102539bc0ab5c8fced047ad4313b9908 (opens in a new tab)
- https://git.kernel.org/stable/c/2a64dbf9c739ddf7a25a066507597bf89f8f73d2 (opens in a new tab)
- https://git.kernel.org/stable/c/64dac2d486ec1eb18dc00968b16a230b6b75ec24 (opens in a new tab)
- https://git.kernel.org/stable/c/a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199 (opens in a new tab)
- https://git.kernel.org/stable/c/fd22b039a5a05bc1d6818e9dcd1001fb432a829d (opens in a new tab)
- https://git.kernel.org/stable/c/be6d26bf27499977c746abc163659915082348d8 (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-2026-48941 (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-2026-64397)Record last updated .