CVE-2026-64138
High
ksmbd: validate SID in parent security descriptor during ACL inheritance
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.
Exploit probability
0.4%
Published
July 19, 2026
Required by
Not available
Last source change
August 20, 2026
02 / AFFECTED SOFTWARE
Affected packages
04 / EVIDENCE
Source records
Open Source Vulnerabilities
CVE-2026-64138
View original source
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/18d8db24b0a5b7be4829238dd4022236df02d421
- https://git.kernel.org/stable/c/1c9d0646a9959752f11ca1080dc1ff26bd1756cb
- https://git.kernel.org/stable/c/69f030cf95488ae1186c72ac8c66fd279664ea7f
- https://git.kernel.org/stable/c/f0e5c9c663badc9982e6941322eef1cb17de0f11
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64138.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-64138