af_unix: read UNIX_DIAG_VFS data under unix_state_lock

Summary

In the Linux kernel, the following vulnerability has been resolved: af_unix: read UNIX_DIAG_VFS data under unix_state_lock Exact UNIX diag lookups hold a reference to the socket, but not to u->path. Meanwhile, unix_release_sock() clears u->path under unix_state_lock() and drops the path reference after unlocking. Read the inode and device numbers for UNIX_DIAG_VFS while holding unix_state_lock(), then emit the netlink attribute after dropping the lock. This keeps the VFS data stable while the reply is being built.

Timeline

1. Apr 25, 2026, 8:46 AM UTCCVE published
2. Oct 16, 2026, 3:12 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 19, 2026, 6:56 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 5f7b0569460b7d8d01ca776430a00505a68b7584 · fixed in e7339db13b9ddb63417b12da55fd6191e59f7442; From 5f7b0569460b7d8d01ca776430a00505a68b7584 · fixed in 4f6a8f10182c3a9d22e8eb183957ae7ade9e4bf7; From 5f7b0569460b7d8d01ca776430a00505a68b7584 · fixed in c3ec44ab4526bbc4b6c9fc845af86488244f4c9b; From 5f7b0569460b7d8d01ca776430a00505a68b7584 · fixed in b9232421a77a649c9376c99fdfc8cb7f79cad34c; From 5f7b0569460b7d8d01ca776430a00505a68b7584 · fixed in 0c739f3785f84af695952c2bac8be2f45082c9b8; From 5f7b0569460b7d8d01ca776430a00505a68b7584 · fixed in 900a4e0910e98b8caef117d5df00471fa438dcf9; From 5f7b0569460b7d8d01ca776430a00505a68b7584 · fixed in bdf206e740bf2919d818f132c8c9cc7ed91d11c0; From 5f7b0569460b7d8d01ca776430a00505a68b7584 · fixed in 39897df386376912d561d4946499379effa1e7ef

• Linux Linux

  3.3

• KernelLinux

  From 3.3.0 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.136; From 6.7.0 · fixed in 6.12.83; From 6.13.0 · fixed in 6.18.24; From 6.19.0 · fixed in 6.19.14

References 8