af_unix: Set gc_in_progress to true in unix_gc().

Summary

In the Linux kernel, the following vulnerability has been resolved: af_unix: Set gc_in_progress to true in unix_gc(). Igor Ushakov reported that unix_gc() could run with gc_in_progress being false if the work is scheduled while running: Thread 1 Thread 2 Thread 3 -------- -------- -------- unix_schedule_gc() unix_schedule_gc() `- if (!gc_in_progress) `- if (!gc_in_progress) |- gc_in_progress = true | `- queue_work() | unix_gc() <----------------/ | | |- gc_in_progress = true ... `- queue_work() | | `- gc_in_progress = false | | unix_gc() <---------------------------------------------' | ... /* gc_in_progress == false */ | `- gc_in_progress = false unix_peek_fpl() relies on gc_in_progress not to confuse GC by MSG_PEEK. Let's set gc_in_progress to true in unix_gc().

Timeline

1. Jul 4, 2026, 11:54 AM UTCCVE published
2. Oct 16, 2026, 3:29 PM UTCCISA SSVC assessment

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

3. Oct 19, 2026, 8:07 PM UTCRecord last updated

Affected versions

• Linux Linux

  From ceb8bd6c69c1680fd9b45e7f16d7170c9c7513a5 · fixed in 20aa894d475bd8086b25c1113ec4ca70f70c7a98; From 328840c93bd6a4871dd10908d01b41eab83eb8e2 · fixed in 82c17e13d404f686e164590483fd6c1abaa675d0; From 8b90a9f819dc2a06baae4ec1a64d875e53b824ec · fixed in 591f1ac217428a6d2b32a8ac14aac0fab44f155a; From 8b90a9f819dc2a06baae4ec1a64d875e53b824ec · fixed in 0cfa78c050662784fc8e3ab26dbfd1dc632b2082; From 8b90a9f819dc2a06baae4ec1a64d875e53b824ec · fixed in d82ba05263c69fa2437fe93e4e561cc40f4c03af; From 6.1.141 · fixed in 6.1.183; From 6.6.93 · fixed in 6.6.144

• Linux Linux

  6.9

• KernelLinux

  fixed in 6.1.183; From 6.2.0 · fixed in 6.6.144; From 6.7.0 · fixed in 6.12.95; From 6.9.0 · fixed in 6.18.38

References 5