CVE-2023-52942

cgroup/cpuset: Fix wrong check in update_parent_subparts_cpumask()

Description

In the Linux kernel, the following vulnerability has been resolved: cgroup/cpuset: Fix wrong check in update_parent_subparts_cpumask() It was found that the check to see if a partition could use up all the cpus from the parent cpuset in update_parent_subparts_cpumask() was incorrect. As a result, it is possible to leave parent with no effective cpu left even if there are tasks in the parent cpuset. This can lead to system panic as reported in [1]. Fix this probem by updating the check to fail the enabling the partition if parent's effective_cpus is a subset of the child's cpus_allowed. Also record the error code when an error happens in update_prstate() and add a test case where parent partition and child have the same cpu list and parent has task. Enabling partition in the child will fail in this case. [1] https://www.spinics.net/lists/cgroups/msg36254.html

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/a2ab7f2cf5ef8f0c6212a246e681d1fe358cec1f
https://git.kernel.org/stable/c/e5ae8803847b80fe9d744a3174abe2b7bfed222a

Frequently Asked Questions

What is the severity of CVE-2023-52942?: CVE-2023-52942 has not yet been assigned a CVSS score.
How to fix CVE-2023-52942?: To fix CVE-2023-52942, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-52942 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2023-52942 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-52942?: CVE-2023-52942 affects Linux Linux, Linux Linux.

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