CVE-2025-38321

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.

CVSS Metrics

• v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.05%• Percentile: 17%

Affected Systems

• linux•linux

  ≥ 73934e535cffbda1490fa97d82690a0f9aa73e94, < b8ced2b9a23a1a2c1e0ed8d0d02512e51bdf38da | ≥ 548812afd96982a76a93ba76c0582ea670c40d9e, < 43f26094d6702e494e800532c3f1606e7a68eb30 | ≥ 3fa640d035e5ae526769615c35cb9ed4be6e3662, < 4479db143390bdcadc1561292aab579cdfa9f6c6 | ≥ 3fa640d035e5ae526769615c35cb9ed4be6e3662, < a2182743a8b4969481f64aec4908ff162e8a206c | ff4528bbc82d0d90073751f7b49e7b9e9c7e5638 | ≥ 6.6.64, < 6.6.95 | ≥ 6.12.2, < 6.12.35 | ≥ 6.11.11, < 6.12 | 6.13

• linux•linux_kernel

  < 6.6.95 | ≥ 6.7, < 6.12.35 | ≥ 6.13, < 6.15.4 | 6.16:rc1 | 6.16:rc2

References (4)

• https://git.kernel.org/stable/c/b8ced2b9a23a1a2c1e0ed8d0d02512e51bdf38da
• https://git.kernel.org/stable/c/43f26094d6702e494e800532c3f1606e7a68eb30
• https://git.kernel.org/stable/c/4479db143390bdcadc1561292aab579cdfa9f6c6
• https://git.kernel.org/stable/c/a2182743a8b4969481f64aec4908ff162e8a206c