CVE-2024-27006

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

thermal/debugfs: Add missing count increment to thermal_debug_tz_trip_up()

The count field in struct trip_stats, representing the number of times

the zone temperature was above the trip point, needs to be incremented

in thermal_debug_tz_trip_up(), for two reasons.

First, if a trip point is crossed on the way up for the first time,

thermal_debug_update_temp() called from update_temperature() does

not see it because it has not been added to trips_crossed[] array

in the thermal zone's struct tz_debugfs object yet. Therefore, when

thermal_debug_tz_trip_up() is called after that, the trip point's

count value is 0, and the attempt to divide by it during the average

temperature computation leads to a divide error which causes the kernel

to crash. Setting the count to 1 before the division by incrementing it

fixes this problem.

Second, if a trip point is crossed on the way up, but it has been

crossed on the way up alread

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References