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.

CVSS 3.1

8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-25)

Published

2025-12-09

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

References

• https://git.kernel.org/stable/c/065bd62412271a2d734810dd50336cae88c54427
• https://git.kernel.org/stable/c/734e99623c5b65bf2c03e35978a0b980ebc3c2f8
• https://git.kernel.org/stable/c/bdb596ceb4b7c3f28786a33840263728217fbcf5
• https://git.kernel.org/stable/c/cb52d9c86d70298de0ab7c7953653898cbc0efd6

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