CVE-2025-38321

smb: Log an error when close_all_cached_dirs fails

State: Published
Severity: 7.8 High
Published: Jul 10, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

smb: Log an error when close_all_cached_dirs fails

Under low-memory conditions, close_all_cached_dirs() can't move the dentries to a separate list to dput() them once the locks are dropped. This will result in a "Dentry still in use" error, so add an error message that makes it clear this is what happened:

[ 495.281119] CIFS: VFS: \\otters.example.com\share Out of memory while dropping dentries [ 495.281595] ------------[ cut here ]------------ [ 495.281887] BUG: Dentry ffff888115531138{i=78,n=/} still in use (2) [unmount of cifs cifs] [ 495.282391] WARNING: CPU: 1 PID: 2329 at fs/dcache.c:1536 umount_check+0xc8/0xf0

Also, bail out of looping through all tcons as soon as a single allocation fails, since we're already in trouble, and kmalloc() attempts for subseqeuent tcons are likely to fail just like the first one did.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	73934e535cffbda1490fa97d82690a0f9aa73e94 to before b8ced2b9a23a1a2c1e0ed8d0d02512e51bdf38daAffected 548812afd96982a76a93ba76c0582ea670c40d9e to before 43f26094d6702e494e800532c3f1606e7a68eb30Affected 3fa640d035e5ae526769615c35cb9ed4be6e3662 to before 4479db143390bdcadc1561292aab579cdfa9f6c6Affected 3fa640d035e5ae526769615c35cb9ed4be6e3662 to before a2182743a8b4969481f64aec4908ff162e8a206cAffected ff4528bbc82d0d90073751f7b49e7b9e9c7e5638Affected 6.6.64 to before 6.6.95Affected 6.12.2 to before 6.12.35Affected 6.11.11 to before 6.12Affected
LinuxLinux	6.13Affected before 6.13Not affected 6.6.95 through 6.6.Not affected 6.12.35 through 6.12.Not affected 6.15.4 through 6.15.*Not affected 6.16 and laterNot affected

Product

Versions

LinuxLinux

73934e535cffbda1490fa97d82690a0f9aa73e94 to before b8ced2b9a23a1a2c1e0ed8d0d02512e51bdf38daAffected
548812afd96982a76a93ba76c0582ea670c40d9e to before 43f26094d6702e494e800532c3f1606e7a68eb30Affected
3fa640d035e5ae526769615c35cb9ed4be6e3662 to before 4479db143390bdcadc1561292aab579cdfa9f6c6Affected
3fa640d035e5ae526769615c35cb9ed4be6e3662 to before a2182743a8b4969481f64aec4908ff162e8a206cAffected
ff4528bbc82d0d90073751f7b49e7b9e9c7e5638Affected
6.6.64 to before 6.6.95Affected
6.12.2 to before 6.12.35Affected
6.11.11 to before 6.12Affected

LinuxLinux

6.13Affected
before 6.13Not affected
6.6.95 through 6.6.*Not affected
6.12.35 through 6.12.*Not affected
6.15.4 through 6.15.*Not affected
6.16 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.