CVE-2026-68098
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.
How to fix
- Linux Linux05aa552bd69a96e090cbd45656e18cdc46524e20, 6d9d7aa4a2c99c31acfa28921c30b684110cf66c, b057a851129c6a084e7e393b62ca3abf6c2660bc, f1eba60db813ec28732bf18b5f0a67ebac9c3100, a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3, 58d97fcd0bf1aee694e244cc28635b9df95b543b or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < 05aa552bd69a96e090cbd45656e18cdc46524e20, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < 6d9d7aa4a2c99c31acfa28921c30b684110cf66c, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < b057a851129c6a084e7e393b62ca3abf6c2660bc, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < f1eba60db813ec28732bf18b5f0a67ebac9c3100, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3, e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ≤ v < 58d97fcd0bf1aee694e244cc28635b9df95b543b, 5.15 | 05aa552bd69a96e090cbd45656e18cdc46524e20, 6d9d7aa4a2c99c31acfa28921c30b684110cf66c, b057a851129c6a084e7e393b62ca3abf6c2660bc, f1eba60db813ec28732bf18b5f0a67ebac9c3100, a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3, 58d97fcd0bf1aee694e244cc28635b9df95b543b |
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