发布于3月6日3月6日 Members Red Hat: CVE-2021-47321: kernel: watchdog: Fix possible use-after-free by calling del_timer_sync() (Multiple Advisories) Severity 4 CVSS (AV:L/AC:L/Au:M/C:N/I:N/A:C) Published 05/21/2024 Created 09/26/2024 Added 09/25/2024 Modified 12/30/2024 Description In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free by calling del_timer_sync() This driver'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-2021-47321 RHSA-2024:7000 RHSA-2024:7001 RHSA-2024:8107
