CVE-2026-74522

CVE CVE-2026-74522EUVD EUVD-2026-59715Published 2026-08-15T12:27:39.000ZLast changed 2026-08-19T16:38:25.000ZCVSS 8.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 5.18; 8510a043d334ecdf83d4604782f288db6bf21d60 <9be4a66f019ea90bd9deca70511f4f9ffebf5c6f; patch: 6.18.44; 8510a043d334ecdf83d4604782f288db6bf21d60 <cffbdc86393b0235383a20c8c59bc32f16036459; patch: 7.1.8; patch: 6.6.151; 5.15.38 <5.16; patch: 7.2; patch: 0; 8510a043d334ecdf83d4604782f288db6bf21d60 <19bfd90d5aaf63217735d81964585c5306158e5f; 8510a043d334ecdf83d4604782f288db6bf21d60 <e7188199eff46a636f3436356f0aae039be6dd66; df30cbfd3d8a70e61ce59f63ce5ed2261799ac10; patch: 6.12.103; 8510a043d334ecdf83d4604782f288db6bf21d60 <67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd; patch: 6.1.183; 8510a043d334ecdf83d4604782f288db6bf21d60 <0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac; 5.17.6 <5.18; aaf1d5ebb358f546414965b39da90107a7ca7ce5

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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