CVE-2026-64397
CVE CVE-2026-64397EUVD EUVD-2026-48941Published 2026-07-25T08:50:41.000ZLast changed 2026-08-05T12:41:35.000ZCVSS 9.8
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <1426fd79102539bc0ab5c8fced047ad4313b9908; patch: 0; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <64dac2d486ec1eb18dc00968b16a230b6b75ec24; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199; patch: 7.2-rc1; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <be6d26bf27499977c746abc163659915082348d8; patch: 6.6.145; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <2a64dbf9c739ddf7a25a066507597bf89f8f73d2; patch: 6.18.39; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <fd22b039a5a05bc1d6818e9dcd1001fb432a829d; 5.15; patch: 6.12.96; patch: 7.1.4; patch: 6.1.178
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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