What happened
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix dir separator in SMB1 UNIX mounts When calling cifs_mount_get_tcon() with SMB1 UNIX mounts, @cifs_sb->mnt_cifs_flags needs to be read or updated only after calling reset_cifs_unix_caps(), otherwise it might end up with missing CIFS_MOUNT_POSIXACL and CIFS_MOUNT_POSIX_PATHS bits. This fixes the wrong dir separator used in paths caused by the missing CIFS_MOUNT_POSIX_PATHS bit in cifs_sb_info::mnt_cifs_flags.
Affected versions
Linux: 4fc3a433c13944ee5766ec5b9bf6f1eb4d29b880 through before fbbfcf35e1ee3396631f3dc6214cb626aa9814c3 (git); 4fc3a433c13944ee5766ec5b9bf6f1eb4d29b880 through before c4d3fc5844d685441befd0caaab648321013cdfd (git); 9d9f6e06123001208cd8ae6332c7e814ab709169 (git); 6.18.53 through before 6.19 (semver); 7.0 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.