CVE-2025-40328
High
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.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Linux
PublishedDec 9, 2025
First seenDec 9, 2025
How to fix
Update
- Linux Linuxbb3355ce9dcaba1b4a766f98b2ad373cab6cd626, cb52d9c86d70298de0ab7c7953653898cbc0efd6, 065bd62412271a2d734810dd50336cae88c54427, bdb596ceb4b7c3f28786a33840263728217fbcf5, 734e99623c5b65bf2c03e35978a0b980ebc3c2f8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | ebe98f1447bbccf8228335c62d86af02a0ed23f7 ≤ v < bb3355ce9dcaba1b4a766f98b2ad373cab6cd626, ebe98f1447bbccf8228335c62d86af02a0ed23f7 ≤ v < cb52d9c86d70298de0ab7c7953653898cbc0efd6, ebe98f1447bbccf8228335c62d86af02a0ed23f7 ≤ v < 065bd62412271a2d734810dd50336cae88c54427, ebe98f1447bbccf8228335c62d86af02a0ed23f7 ≤ v < bdb596ceb4b7c3f28786a33840263728217fbcf5, ebe98f1447bbccf8228335c62d86af02a0ed23f7 ≤ v < 734e99623c5b65bf2c03e35978a0b980ebc3c2f8, 6.1 | bb3355ce9dcaba1b4a766f98b2ad373cab6cd626, cb52d9c86d70298de0ab7c7953653898cbc0efd6, 065bd62412271a2d734810dd50336cae88c54427, bdb596ceb4b7c3f28786a33840263728217fbcf5, 734e99623c5b65bf2c03e35978a0b980ebc3c2f8 |
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