Answer in brief
CVE-2026-64392 records a Unknown severity vulnerability in ksmbd: use opener credentials for delete-on-close. 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 <f08b3f451f12eee4abd8a5981803bc36db84458b || >=f44158485826c076335d6860d35872271a83791d <18c59109bb6fb816d5102171666f87cf1e29901d || >=f44158485826c076335d6860d35872271a83791d <e72c15085b6d86f45d224d98aa75b5cace4aaab9 || >=f44158485826c076335d6860d35872271a83791d <4b7059974549d278e30fe70e2a4e421f9839817d || >=f44158485826c076335d6860d35872271a83791d <52e2f21911158ec961cd5aae19c56460db382af0 | f08b3f451f12eee4abd8a5981803bc36db84458b, 18c59109bb6fb816d5102171666f87cf1e29901d, e72c15085b6d86f45d224d98aa75b5cace4aaab9, 4b7059974549d278e30fe70e2a4e421f9839817d, 52e2f21911158ec961cd5aae19c56460db382af0 |
| 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 delete-on-close Delete-on-close can be completed by deferred or durable handle teardown, where no request work is available. Both the base-file unlink and the ADS xattr removal consequently run with the ksmbd worker credentials and can bypass filesystem permission checks. Run both operations with the credentials captured in struct file when the handle was opened. This preserves the authenticated user's fsuid, fsgid, supplementary groups and capability restrictions at final close.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64392 records a Unknown severity vulnerability in ksmbd: use opener credentials for delete-on-close. 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 <f08b3f451f12eee4abd8a5981803bc36db84458b || >=f44158485826c076335d6860d35872271a83791d <18c59109bb6fb816d5102171666f87cf1e29901d || >=f44158485826c076335d6860d35872271a83791d <e72c15085b6d86f45d224d98aa75b5cace4aaab9 || >=f44158485826c076335d6860d35872271a83791d <4b7059974549d278e30fe70e2a4e421f9839817d || >=f44158485826c076335d6860d35872271a83791d <52e2f21911158ec961cd5aae19c56460db382af0 | f08b3f451f12eee4abd8a5981803bc36db84458b, 18c59109bb6fb816d5102171666f87cf1e29901d, e72c15085b6d86f45d224d98aa75b5cace4aaab9, 4b7059974549d278e30fe70e2a4e421f9839817d, 52e2f21911158ec961cd5aae19c56460db382af0 |
| 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 delete-on-close Delete-on-close can be completed by deferred or durable handle teardown, where no request work is available. Both the base-file unlink and the ADS xattr removal consequently run with the ksmbd worker credentials and can bypass filesystem permission checks. Run both operations with the credentials captured in struct file when the handle was opened. This preserves the authenticated user's fsuid, fsgid, supplementary groups and capability restrictions at final close.
Quoted source text, attributed separately from HOL analysis.