CVE-2026-68097
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
In the Linux kernel, ksmbd has an issue with validating ACE size against SID sub-authorities. set_ntacl_dacl() does not verify that the declared ACE size contains all sub-authorities, leading to copying undersized ACEs and later out-of-bounds reads during deduplication.
Risk Assessment
This can lead to out-of-bounds memory reads, potentially exploited for attacks or data integrity violations.
Recommendation
Apply the patch that requires enough input for the fixed SID header, rejects ACEs smaller than that header, and skips ACEs whose declared size cannot contain the complete SID.
Original NVD description (English source)
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.