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High severity8.8NVD Advisory· Published Jul 19, 2026· Updated Aug 18, 2026

CVE-2026-64138

CVE-2026-64138

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.

Affected products

7
  • Linux/Kernel6 versions
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 5 more
    • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=5.15,<6.12.92
    • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*
    • (no CPE)
  • osv-coords
    pkg:linux/kernel
    Range: >= 5.15.0, < 6.12.92

Patches

Vulnerability mechanics

References

4

News mentions

0

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CVE-2026-64138 · High · VYPR