Description
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.
References5
- git.kernel.org/stable/c/065bd62412271a2d734810dd50336cae88c54427
- git.kernel.org/stable/c/734e99623c5b65bf2c03e35978a0b980ebc3c2f8
- git.kernel.org/stable/c/bb3355ce9dcaba1b4a766f98b2ad373cab6cd626
- git.kernel.org/stable/c/bdb596ceb4b7c3f28786a33840263728217fbcf5
- git.kernel.org/stable/c/cb52d9c86d70298de0ab7c7953653898cbc0efd6
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 43 · as of 11 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.