High 8.8Published Jul 19, 2026

CVE-2026-64138ksmbd: validate SID in parent security descriptor during ACL inheritance

Updated under an hour ago (Oct 26, 2026, 6:00 PM ET)

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Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 8efbea0253b7fa2d1960cab0fed36544ca0b41ab; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before f0e5c9c663badc9982e6941322eef1cb17de0f11; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 18d8db24b0a5b7be4829238dd4022236df02d421; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 1c9d0646a9959752f11ca1080dc1ff26bd1756cb; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 69f030cf95488ae1186c72ac8c66fd279664ea7f	CNA record
linux linux_kernel linux:linux_kernel	from 5.15 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; 7.1; 7.1; 7.1	NVD

References

References

https://git.kernel.org/stable/c/8efbea0253b7fa2d1960cab0fed36544ca0b41ab
https://git.kernel.org/stable/c/f0e5c9c663badc9982e6941322eef1cb17de0f11	patch
https://git.kernel.org/stable/c/18d8db24b0a5b7be4829238dd4022236df02d421	patch
https://git.kernel.org/stable/c/1c9d0646a9959752f11ca1080dc1ff26bd1756cb	patch
https://git.kernel.org/stable/c/69f030cf95488ae1186c72ac8c66fd279664ea7f	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.