Red Hat: CVE-2024-36932: kernel: thermal/debugfs: Prevent use-after-free from occurring after cdev removal (Multiple Advisories)

Red Hat: CVE-2024-36932: kernel: thermal/debugfs: Prevent use-after-free from occurring after cdev removal (Multiple Advisories)

Severity

5

CVSS

(AV:L/AC:L/Au:M/C:P/I:N/A:C)

Published

05/30/2024

Created

12/06/2024

Added

12/05/2024

Modified

12/05/2024

Description

In the Linux kernel, the following vulnerability has been resolved: thermal/debugfs: Prevent use-after-free from occurring after cdev removal Since thermal_debug_cdev_remove() does not run under cdev->lock, it can run in parallel with thermal_debug_cdev_state_update() and it may free the struct thermal_debugfs object used by the latter after it has been checked against NULL. If that happens, thermal_debug_cdev_state_update() will access memory that has been freed already causing the kernel to crash. Address this by using cdev->lock in thermal_debug_cdev_remove() around the cdev->debugfs value check (in case the same cdev is removed at the same time in two different threads) and its reset to NULL. Cc :6.8+ <[email protected]> # 6.8+

Solution(s)

• redhat-upgrade-kernel
• redhat-upgrade-kernel-rt

References

• CVE-2024-36932
• RHSA-2024:9315