Answer in brief
CVE-2026-64391 records a Unknown severity vulnerability in ksmbd: use opener credentials for ADS I/O. 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 | >=f44158485826c076335d6860d35872271a83791d <a8f5d39971bbad9340d49cd41b0e2da9452a649d || >=f44158485826c076335d6860d35872271a83791d <2b4592cea214683de0f2ce6f8c22c097fb0ea1ab || >=f44158485826c076335d6860d35872271a83791d <52a56cf53ec834c44ac1b4d16d585f26613ee5ce || >=f44158485826c076335d6860d35872271a83791d <baa5e094886fffa7e6272edcb5e08be5ce28262c | a8f5d39971bbad9340d49cd41b0e2da9452a649d, 2b4592cea214683de0f2ce6f8c22c097fb0ea1ab, 52a56cf53ec834c44ac1b4d16d585f26613ee5ce, baa5e094886fffa7e6272edcb5e08be5ce28262c |
| 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: use opener credentials for ADS I/O Alternate data streams are stored as xattrs. Unlike regular file I/O, their read and write paths therefore call VFS xattr helpers which recheck inode permissions and LSM policy using the current task credentials. Run ADS I/O with the credentials captured when the SMB handle was opened.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64391 records a Unknown severity vulnerability in ksmbd: use opener credentials for ADS I/O. 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 | >=f44158485826c076335d6860d35872271a83791d <a8f5d39971bbad9340d49cd41b0e2da9452a649d || >=f44158485826c076335d6860d35872271a83791d <2b4592cea214683de0f2ce6f8c22c097fb0ea1ab || >=f44158485826c076335d6860d35872271a83791d <52a56cf53ec834c44ac1b4d16d585f26613ee5ce || >=f44158485826c076335d6860d35872271a83791d <baa5e094886fffa7e6272edcb5e08be5ce28262c | a8f5d39971bbad9340d49cd41b0e2da9452a649d, 2b4592cea214683de0f2ce6f8c22c097fb0ea1ab, 52a56cf53ec834c44ac1b4d16d585f26613ee5ce, baa5e094886fffa7e6272edcb5e08be5ce28262c |
| 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: use opener credentials for ADS I/O Alternate data streams are stored as xattrs. Unlike regular file I/O, their read and write paths therefore call VFS xattr helpers which recheck inode permissions and LSM policy using the current task credentials. Run ADS I/O with the credentials captured when the SMB handle was opened.
Quoted source text, attributed separately from HOL analysis.