CVE-2021-4032

Public Exploit

Description

A vulnerability was found in the Linux kernel's KVM subsystem in arch/x86/kvm/lapic.c kvm_free_lapic when a failure allocation was detected. In this flaw the KVM subsystem may crash the kernel due to mishandling of memory errors that happens during VCPU construction, which allows an attacker with special user privilege to cause a denial of service. This flaw affects kernel versions prior to 5.15 rc7.

Category

4.4
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.04%
Third-Party Advisory redhat.com Third-Party Advisory kernel.org Third-Party Advisory lkml.org
Affected: n/a kernel
Published at:
Updated at:

References

Link Tags
https://bugzilla.redhat.com/show_bug.cgi?id=2027403 issue tracking third party advisory patch
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f7d8a19f9a056a05c5c509fa65af472a322abfee exploit third party advisory patch
https://lkml.org/lkml/2021/9/8/587 third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-4032?
CVE-2021-4032 has been scored as a medium severity vulnerability.
How to fix CVE-2021-4032?
To fix CVE-2021-4032, 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-2021-4032 being actively exploited in the wild?
It is possible that CVE-2021-4032 is being exploited or will be exploited in a near future based on public information. 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-2021-4032?
CVE-2021-4032 affects n/a kernel.
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