CVE-2026-64138

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 3.1

8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 35% of CVEs (scores of 2026-10-25)

Published

2026-07-19

Modified

2026-10-21

Record from

the NVD, synced 2026-10-22

Affected

• linux:linux_kernel

References

• 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/8efbea0253b7fa2d1960cab0fed36544ca0b41ab
• https://git.kernel.org/stable/c/f0e5c9c663badc9982e6941322eef1cb17de0f11

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