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Date: Tue, 9 Aug 2022 14:13:40 -0300
From: Thadeu Lima de Souza Cascardo <>
Subject: CVE-2022-2585 - Linux kernel POSIX CPU timer UAF

CVE-2022-2585 - Linux kernel POSIX CPU timer UAF

It was discovered that when exec'ing from a non-leader thread, armed POSIX
CPU timers would be left on a list but freed, leading to a use-after-free.

An independent security researcher working with SSD Secure Disclosure
discovered that this vulnerability could be exploited for Local Privilege

This bug was introduced by commit 55e8c8eb2c7b ("posix-cpu-timers: Store a
reference to a pid not a task"), which is present since v5.7-rc1.

This has been assigned CVE-2022-2585.

A PoC that will trigger KASAN is going to be posted in a week.

A fix has been sent to and is at

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