CVE-2025-40320
Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential cfid UAF in smb2_query_info_compound When smb2_query_info_compound() retries, a previously allocated cfid may have been freed in the first attempt. Because cfid wasn't reset on replay, later cleanup could act on a stale pointer, leading to a potential use-after-free. Reinitialize cfid to NULL under the replay label. Example trace (trimmed): refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 11224 at ../lib/refcount.c:28 refcount_warn_saturate+0x9c/0x110 [...] RIP: 0010:refcount_warn_saturate+0x9c/0x110 [...] Call Trace: <TASK> smb2_query_info_compound+0x29c/0x5c0 [cifs f90b72658819bd21c94769b6a652029a07a7172f] ? step_into+0x10d/0x690 ? __legitimize_path+0x28/0x60 smb2_queryfs+0x6a/0xf0 [cifs f90b72658819bd21c94769b6a652029a07a7172f] smb311_queryfs+0x12d/0x140 [cifs f90b72658819bd21c94769b6a652029a07a7172f] ? kmem_cache_alloc+0x18a/0x340 ? getname_flags+0x46/0x1e0 cifs_statfs+0x9f/0x2b0 [cifs f90b72658819bd21c94769b6a652029a07a7172f] statfs_by_dentry+0x67/0x90 vfs_statfs+0x16/0xd0 user_statfs+0x54/0xa0 __do_sys_statfs+0x20/0x50 do_syscall_64+0x58/0x80
How to fix
- Linux Linux939c4e33005e2a56ea8fcedddf0da92df864bd3b, 327f89c21601ebb7889f8c97754b76f08ce95a0c, b556c278d43f4707a9073ca74d55581b4f279806, 5c76f9961c170552c1d07c830b5e145475151600, 6.6.117 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 433042a91f9373241307725b52de573933ffedbf ≤ v < 939c4e33005e2a56ea8fcedddf0da92df864bd3b, 4f1fffa2376922f3d1d506e49c0fd445b023a28e ≤ v < 327f89c21601ebb7889f8c97754b76f08ce95a0c, 4f1fffa2376922f3d1d506e49c0fd445b023a28e ≤ v < b556c278d43f4707a9073ca74d55581b4f279806, 4f1fffa2376922f3d1d506e49c0fd445b023a28e ≤ v < 5c76f9961c170552c1d07c830b5e145475151600, 6.6.32 ≤ v < 6.6.117, 6.8 | 939c4e33005e2a56ea8fcedddf0da92df864bd3b, 327f89c21601ebb7889f8c97754b76f08ce95a0c, b556c278d43f4707a9073ca74d55581b4f279806, 5c76f9961c170552c1d07c830b5e145475151600, 6.6.117 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.