CVE-2025-40320

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2025
Source publication: Dec 8, 2025
Source updated: Oct 15, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

smb: client: fix potential cfid UAF in smb2_query_info_compound

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

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Linux

Vendor: Linux
Product: Linux
Platforms: Unknown
Default status: unaffected

Linux · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
433042a91f9373241307725b52de573933ffedbf	`affected`	git	939c4e33005e2a56ea8fcedddf0da92df864bd3b	Unavailable	None listed
4f1fffa2376922f3d1d506e49c0fd445b023a28e	`affected`	git	327f89c21601ebb7889f8c97754b76f08ce95a0c	Unavailable	None listed
4f1fffa2376922f3d1d506e49c0fd445b023a28e	`affected`	git	b556c278d43f4707a9073ca74d55581b4f279806	Unavailable	None listed
4f1fffa2376922f3d1d506e49c0fd445b023a28e	`affected`	git	5c76f9961c170552c1d07c830b5e145475151600	Unavailable	None listed
6.6.32	`affected`	semver	6.6.117	Unavailable	None listed

Linux

Vendor: Linux
Product: Linux
Platforms: Unknown
Default status: affected

Linux · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.8	`affected`	Unavailable	Unavailable	Unavailable	None listed
0	`unaffected`	semver	6.8	Unavailable	None listed
6.6.117	`unaffected`	semver	Unavailable	6.6.*	None listed
6.12.58	`unaffected`	semver	Unavailable	6.12.*	None listed
6.17.8	`unaffected`	semver	Unavailable	6.17.*	None listed
6.18	`unaffected`	original_commit_for_fix	Unavailable	*	None listed