Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 6d9d7aa4a2c99c31acfa28921c30b684110cf66c; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before b057a851129c6a084e7e393b62ca3abf6c2660bc; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before f1eba60db813ec28732bf18b5f0a67ebac9c3100; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 58d97fcd0bf1aee694e244cc28635b9df95b543b |
| Linux / Linux | affected 5.15; unaffected 0 before 5.15; unaffected 6.6.148 through 6.6.*; unaffected 6.12.101 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.6 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/6d9d7aa4a2c99c31acfa28921c30b684110cf66c
- https://git.kernel.org/stable/c/b057a851129c6a084e7e393b62ca3abf6c2660bc
- https://git.kernel.org/stable/c/f1eba60db813ec28732bf18b5f0a67ebac9c3100
- https://git.kernel.org/stable/c/a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3
- https://git.kernel.org/stable/c/58d97fcd0bf1aee694e244cc28635b9df95b543b
ADP enrichment
No English description supplied.
No references supplied.