What happened
In the Linux kernel, the following vulnerability has been resolved: ksmbd: preserve VFS inherited POSIX ACL mask The VFS initializes a child's POSIX ACL from the parent's default ACL and the requested creation mode. Do not mutate the parent ACL or overwrite the child's VFS-computed access and default ACLs afterwards. This preserves restrictive ACL_MASK entries and prevents SMB object creation from widening effective permissions.
Affected versions
Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 through before 591acf171644de590cda245fd8595b473a1beb70 (git); 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 through before 0093909becbda22b62b39b654dbc607faed59cd0 (git); 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 through before e148e567a9252643baa125cb65d7ae9c2c6cf68a (git); before 6.12.111 (semver); before 6.18.53 (semver) Fixed: See vendor advisory.
Why it matters
Review the vendor advisory and exposure of the affected product to determine operational impact.
Detection & mitigation
- Apply vendor-provided updates or mitigations.
- Review affected product exposure and access logs.
Public PoC references
No public PoC reference has passed the current publication threshold.