CVE-2025-40320

Description

In the Linux kernel, the following vulnerability has been resolved:smb: client: fix potential cfid UAF in smb2_query_info_compoundWhen smb2_query_info_compound() retries, a previously allocated cfid mayhave been freed in the first attempt.Because cfid wasnt reset on replay, later cleanup could act on a stalepointer, 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: 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

Risk Information

Base Score

6.3

MODERATE

Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:H

EPSS Score

Exploitation Probability

0.026

Associated Vulnerability

No records found

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234