CVE-2026-93786

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 591acf171644de590cda245fd8595b473a1beb70affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0093909becbda22b62b39b654dbc607faed59cd0affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e148e567a9252643baa125cb65d7ae9c2c6cf68aaffected
LinuxLinux0 < 6.12.111affected
LinuxLinux0 < 6.18.53affected
LinuxLinux6.12.111 <= 6.12.*unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References