CVE-2026-64397
Last modified
CVE-2026-64397 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.48% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 1426fd79102539bc0ab5c8fced047ad4313b9908; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 2a64dbf9c739ddf7a25a066507597bf89f8f73d2; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 64dac2d486ec1eb18dc00968b16a230b6b75ec24; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < fd22b039a5a05bc1d6818e9dcd1001fb432a829d; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < be6d26bf27499977c746abc163659915082348d8 |
| Linux | Linux | 5.15 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
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