Vulnerability in Linux

CVE-2025-40328

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF in smb2_close_cached_fid() find_or_create_cached_dir() could grab a new reference after kref_put() had seen the refcount drop to zero but before cfid_list_lock is acquired in smb2_close_cached_fid(), leading to use-after-free. Switch to kref_put_lock() so cfid_release() is called with cfid_list_lock held, closing that gap.

EPSS: 0.002 (10.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

  • Linux — versions ebe98f1447bbccf8228335c62d86af02a0ed23f7, 6.1, 0

References

Frequently asked questions

What is CVE-2025-40328?
CVE-2025-40328 is a high-severity vulnerability in Linux. CVSS score: 8.8/10. Published 2025-12-09.
How severe is CVE-2025-40328?
High severity. CVSS v3 base score is 8.8 out of 10.