af_unix: Set gc_in_progress to true in unix_gc().
43Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 7.1epss 0.1%
from disclosure to weapon37 days
Published on NVDJul 4
1st PoC+37d
exploitation probability
0.1%top 97% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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().
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Affected products
Linux · Linuxpublic PoCs found — 1
githubgithub.com/sgkdev/bad_garbage★ 26⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
https://git.kernel.org/stable/c/0cfa78c050662784fc8e3ab26dbfd1dc632b2082https://git.kernel.org/stable/c/20aa894d475bd8086b25c1113ec4ca70f70c7a98https://git.kernel.org/stable/c/591f1ac217428a6d2b32a8ac14aac0fab44f155ahttps://git.kernel.org/stable/c/82c17e13d404f686e164590483fd6c1abaa675d0https://git.kernel.org/stable/c/d82ba05263c69fa2437fe93e4e561cc40f4c03af