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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-68098

ksmbd: bound DACL dedup walk to copied ACEs

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < 6d9d7aa4a2c99c31acfa28921c30b684110cf66caffected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < b057a851129c6a084e7e393b62ca3abf6c2660bcaffected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < f1eba60db813ec28732bf18b5f0a67ebac9c3100affected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3affected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < 58d97fcd0bf1aee694e244cc28635b9df95b543baffected

Linux Linux

Default version status: affected

  • 5.15affected
  • 0 to < 5.15unaffected
  • 6.6.148 to ≤ 6.6.*unaffected
  • 6.12.101 to ≤ 6.12.*unaffected
  • 6.18.42 to ≤ 6.18.*unaffected
  • 7.1.6 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References