Date: Tue, 9 Aug 2022 14:13:40 -0300 From: Thadeu Lima de Souza Cascardo <cascardo@...onical.com> To: oss-security@...ts.openwall.com 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 Escalation. 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 linux-kernel@...r.kernel.org and is at https://email@example.com/T/#u.
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