CVE-2026-64397ksmbd: serialize QUERY_DIRECTORY requests per file
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 1426fd79102539bc0ab5c8fced047ad4313b9908; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 2a64dbf9c739ddf7a25a066507597bf89f8f73d2; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 64dac2d486ec1eb18dc00968b16a230b6b75ec24; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before fd22b039a5a05bc1d6818e9dcd1001fb432a829d; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before be6d26bf27499977c746abc163659915082348d8 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.15 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4 | NVD |
References
- https://git.kernel.org/stable/c/1426fd79102539bc0ab5c8fced047ad4313b9908patch
- https://git.kernel.org/stable/c/2a64dbf9c739ddf7a25a066507597bf89f8f73d2patch
- https://git.kernel.org/stable/c/64dac2d486ec1eb18dc00968b16a230b6b75ec24patch
- https://git.kernel.org/stable/c/a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199patch
- https://git.kernel.org/stable/c/fd22b039a5a05bc1d6818e9dcd1001fb432a829dpatch
- https://git.kernel.org/stable/c/be6d26bf27499977c746abc163659915082348d8patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.