CVE-2026-53361

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().