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CVE-2026-64138

HIGHCVSS 8.8/10EPSS 0.41%

Last modified

CVE-2026-64138 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 0.41% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
8.8/10

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

EPSS Probability
0.41%

34.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < f0e5c9c663badc9982e6941322eef1cb17de0f11; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 18d8db24b0a5b7be4829238dd4022236df02d421; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 1c9d0646a9959752f11ca1080dc1ff26bd1756cb; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 69f030cf95488ae1186c72ac8c66fd279664ea7f
LinuxLinux5.15

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is 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.
How severe is CVE-2026-64138?
CVE-2026-64138 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.41% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64138?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST