CVE-2026-68098

Summary

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: bound DACL dedup walk to copied ACEs

set_ntacl_dacl() can stop copying ACEs before consuming the full input DACL when size accounting overflows.

When that happens, num_aces reflects only the ACEs that were actually copied into the output DACL, but set_posix_acl_entries_dacl() still receives nt_num_aces and uses it to walk the existing ACE array during dedup.

That makes the dedup walk scan past the copied ACE array and inspect buffer tail that does not contain valid ACEs.

Split the two meanings currently carried by the NT ACE count. Pass the number of copied NT ACEs to bound the dedup walk, and preserve the original "input DACL had NT ACEs" state separately for the Everyone/default ACL fallback.

This keeps the dedup walk aligned with the ACEs that are actually present in the rebuilt DACL.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6d9d7aa4a2c99c31acfa28921c30b684110cf66caffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b057a851129c6a084e7e393b62ca3abf6c2660bcaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f1eba60db813ec28732bf18b5f0a67ebac9c3100affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 58d97fcd0bf1aee694e244cc28635b9df95b543baffected
LinuxLinux0 < 6.6.148affected
LinuxLinux0 < 6.12.101affected
LinuxLinux0 < 6.18.42affected
LinuxLinux0 < 7.1.6affected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.42 <= 6.18.*unaffected
LinuxLinux7.1.6 <= 7.1.*unaffected
LinuxLinux7.2-rc5 <= *unaffected

Weaknesses

References