Answer in brief
CVE-2026-64138 records a Unknown severity vulnerability in ksmbd: validate SID in parent security descriptor during ACL inheritance. 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 <f0e5c9c663badc9982e6941322eef1cb17de0f11 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <18d8db24b0a5b7be4829238dd4022236df02d421 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <1c9d0646a9959752f11ca1080dc1ff26bd1756cb || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <69f030cf95488ae1186c72ac8c66fd279664ea7f | f0e5c9c663badc9982e6941322eef1cb17de0f11, 18d8db24b0a5b7be4829238dd4022236df02d421, 1c9d0646a9959752f11ca1080dc1ff26bd1756cb, 69f030cf95488ae1186c72ac8c66fd279664ea7f |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Jul 19, 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: validate SID in parent security descriptor during ACL inheritance Introduce smb_validate_ntsd_sid() helper to safely validate Owner SID and Group SID inside the NT Security Descriptor (smb_ntsd) retrieved from the parent directory.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64138 records a Unknown severity vulnerability in ksmbd: validate SID in parent security descriptor during ACL inheritance. 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 <f0e5c9c663badc9982e6941322eef1cb17de0f11 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <18d8db24b0a5b7be4829238dd4022236df02d421 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <1c9d0646a9959752f11ca1080dc1ff26bd1756cb || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <69f030cf95488ae1186c72ac8c66fd279664ea7f | f0e5c9c663badc9982e6941322eef1cb17de0f11, 18d8db24b0a5b7be4829238dd4022236df02d421, 1c9d0646a9959752f11ca1080dc1ff26bd1756cb, 69f030cf95488ae1186c72ac8c66fd279664ea7f |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Jul 19, 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: validate SID in parent security descriptor during ACL inheritance Introduce smb_validate_ntsd_sid() helper to safely validate Owner SID and Group SID inside the NT Security Descriptor (smb_ntsd) retrieved from the parent directory.
Quoted source text, attributed separately from HOL analysis.