CVE-2026-68097: In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate ACE size against SID sub-authorities set_ntacl_dacl() validates ...

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate ACE size against SID sub-authorities set_ntacl_dacl() validates sid.num_subauth before copying an ACE, but does not verify that the declared ACE size contains all sub-authorities described by that field. An undersized ACE can therefore be copied and later make the POSIX ACL deduplication walk inspect data beyond the copied ACE boundary. The existing initial bound check is also too small. It only ensures that the ACE size field is accessible before set_ntacl_dacl() reads sid.num_subauth farther into the input buffer. Require enough input for the fixed SID header before accessing num_subauth, reject ACEs smaller than that header, and skip ACEs whose declared size cannot contain the complete SID. This makes the validation consistent with the other ACE walk paths.

Affected Software

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

Vendor	Product	Versions
Linux	Linux	>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b7cb5bf0855470799f12da825de91e48951b3876; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 62d80d7c2d9428085e7458ad4c06ca8c0984039b; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 337022d9dfac441c3b35e4455a51aa981996e02e; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 61fd3559199f7fa693dcbff35e59477e24af041a; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 5152c6d49e3fd4e9f2e857c57527aead752f1f87; < 6.6.148; < 6.12.101; < 6.18.42; < 7.1.6
Linux	Linux	All versions

References

Timeline

Published: Aug 10, 2026
Last Modified: Aug 10, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-68097?

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate ACE size against SID sub-authorities set_ntacl_dacl() validates sid.num_subauth before copying an ACE, but does not verify that the declared ACE size contains all sub-authorities described by that field. An undersized ACE can therefore be copied and later make the POSIX ACL deduplication walk inspect data beyond the copied ACE boundary. The existing initial bound check is also too small. It only ensures that the ACE size field is accessible before set_ntacl_dacl() reads sid.num_subauth farther into the input buffer. Require enough input for the fixed SID header before accessing num_subauth, reject ACEs smaller than that header, and skip ACEs whose declared size cannot contain the complete SID. This makes the validation consistent with the other ACE walk paths.

How severe is CVE-2026-68097?

Severity scoring for CVE-2026-68097 is pending analysis.

How do I fix CVE-2026-68097?

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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