Answer in brief
CVE-2026-64397 records a Unknown severity vulnerability in ksmbd: serialize QUERY_DIRECTORY requests per file. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <1426fd79102539bc0ab5c8fced047ad4313b9908 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <2a64dbf9c739ddf7a25a066507597bf89f8f73d2 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <64dac2d486ec1eb18dc00968b16a230b6b75ec24 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <fd22b039a5a05bc1d6818e9dcd1001fb432a829d || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <be6d26bf27499977c746abc163659915082348d8 | 1426fd79102539bc0ab5c8fced047ad4313b9908, 2a64dbf9c739ddf7a25a066507597bf89f8f73d2, 64dac2d486ec1eb18dc00968b16a230b6b75ec24, a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199, fd22b039a5a05bc1d6818e9dcd1001fb432a829d, be6d26bf27499977c746abc163659915082348d8 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64397 records a Unknown severity vulnerability in ksmbd: serialize QUERY_DIRECTORY requests per file. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <1426fd79102539bc0ab5c8fced047ad4313b9908 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <2a64dbf9c739ddf7a25a066507597bf89f8f73d2 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <64dac2d486ec1eb18dc00968b16a230b6b75ec24 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <fd22b039a5a05bc1d6818e9dcd1001fb432a829d || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <be6d26bf27499977c746abc163659915082348d8 | 1426fd79102539bc0ab5c8fced047ad4313b9908, 2a64dbf9c739ddf7a25a066507597bf89f8f73d2, 64dac2d486ec1eb18dc00968b16a230b6b75ec24, a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199, fd22b039a5a05bc1d6818e9dcd1001fb432a829d, be6d26bf27499977c746abc163659915082348d8 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.