CVE-2026-74522ksmbd: fix use-after-free in __close_file_table_ids()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in __close_file_table_ids() A ksmbd_file can remain alive after logical close while another session holds a temporary reference obtained through ksmbd_lookup_fd_inode(). ksmbd_close_fd() currently marks the file closed and drops the idr-owned reference, but leaves the pointer published in the closing session's idr until the final reference is dropped. If the foreign holder performs the final ksmbd_fd_put(), __put_fd_final() supplies the foreign session's file table to __ksmbd_close_fd(). The object is then freed without being removed from its owner's idr, and the owner session later dereferences the stale pointer during file-table teardown. Remove the volatile id from the owner's idr while ksmbd_close_fd() still holds that table's lock, and clear volatile_id before dropping the idr-owned reference. A later foreign final put then only performs physical destruction and cannot remove the object from the wrong table.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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
- Received
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 8510a043d334ecdf83d4604782f288db6bf21d60 builds before 19bfd90d5aaf63217735d81964585c5306158e5f; 8510a043d334ecdf83d4604782f288db6bf21d60 builds before 67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd; 8510a043d334ecdf83d4604782f288db6bf21d60 builds before 0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac; 8510a043d334ecdf83d4604782f288db6bf21d60 builds before 9be4a66f019ea90bd9deca70511f4f9ffebf5c6f; from 8510a043d334ecdf83d4604782f288db6bf21d60 before cffbdc86393b0235383a20c8c59bc32f16036459; from 8510a043d334ecdf83d4604782f288db6bf21d60 before e7188199eff46a636f3436356f0aae039be6dd66; df30cbfd3d8a70e61ce59f63ce5ed2261799ac10; aaf1d5ebb358f546414965b39da90107a7ca7ce5; and 2 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/19bfd90d5aaf63217735d81964585c5306158e5f
- https://git.kernel.org/stable/c/67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd
- https://git.kernel.org/stable/c/0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac
- https://git.kernel.org/stable/c/9be4a66f019ea90bd9deca70511f4f9ffebf5c6f
- https://git.kernel.org/stable/c/cffbdc86393b0235383a20c8c59bc32f16036459
- https://git.kernel.org/stable/c/e7188199eff46a636f3436356f0aae039be6dd66
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.