发布于3月6日3月6日 Members Red Hat: CVE-2021-47356: kernel: mISDN: fix possible use-after-free in HFC_cleanup() (Multiple Advisories) Severity 7 CVSS (AV:L/AC:L/Au:M/C:C/I:C/A:C) Published 05/21/2024 Created 07/03/2024 Added 07/03/2024 Modified 09/25/2024 Description In the Linux kernel, the following vulnerability has been resolved: mISDN: fix possible use-after-free in HFC_cleanup() This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself. Solution(s) redhat-upgrade-kernel redhat-upgrade-kernel-rt References CVE-2021-47356 RHSA-2024:4211 RHSA-2024:4352 RHSA-2024:6993
