CVE-2021-4032

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.

• CWE-459
• CWE-459

• https://bugzilla.redhat.com/show_bug.cgi?id=2027403Issue Tracking, Patch, Third Party Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f7d8a19f9a056a05c5c509fa65af472a322abfeeExploit, Patch, Third Party Advisory
• https://lkml.org/lkml/2021/9/8/587Exploit, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2027403Issue Tracking, Patch, Third Party Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f7d8a19f9a056a05c5c509fa65af472a322abfeeExploit, Patch, Third Party Advisory
• https://lkml.org/lkml/2021/9/8/587Exploit, Third Party Advisory

Published

Jan 21, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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