CVE-2025-40328smb: client: fix potential UAF in smb2_close_cached_fid()
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ebe98f1447bbccf8228335c62d86af02a0ed23f7 before cb52d9c86d70298de0ab7c7953653898cbc0efd6; from ebe98f1447bbccf8228335c62d86af02a0ed23f7 before 065bd62412271a2d734810dd50336cae88c54427; from ebe98f1447bbccf8228335c62d86af02a0ed23f7 before bdb596ceb4b7c3f28786a33840263728217fbcf5; from ebe98f1447bbccf8228335c62d86af02a0ed23f7 before 734e99623c5b65bf2c03e35978a0b980ebc3c2f8 | CNA record |
References
- https://git.kernel.org/stable/c/cb52d9c86d70298de0ab7c7953653898cbc0efd6
- https://git.kernel.org/stable/c/065bd62412271a2d734810dd50336cae88c54427
- https://git.kernel.org/stable/c/bdb596ceb4b7c3f28786a33840263728217fbcf5
- https://git.kernel.org/stable/c/734e99623c5b65bf2c03e35978a0b980ebc3c2f8
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.