Bug 2027403 (CVE-2021-4032) - CVE-2021-4032 kernel: kvm: mishandling of memory error during VCPU construction can lead to DoS
Summary: CVE-2021-4032 kernel: kvm: mishandling of memory error during VCPU constructi...
Keywords:
Status: NEW
Alias: CVE-2021-4032
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Nobody
QA Contact:
URL:
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Depends On: 2027406 2029213 2029214 2029215
Blocks: 2026965 2027405
TreeView+ depends on / blocked
 
Reported: 2021-11-29 14:55 UTC by Guilherme de Almeida Suckevicz
Modified: 2023-09-19 14:13 UTC (History)
39 users (show)

Fixed In Version: kernel 5.15 rc7
Doc Type: If docs needed, set a value
Doc Text:
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.
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Description Guilherme de Almeida Suckevicz 2021-11-29 14:55:14 UTC 
A vulnerability was found in the KVM subsystem in arch/x86/kvm/lapic.c kvm_free_lapic when the 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.

Reference:
https://lkml.org/lkml/2021/9/8/587
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f7d8a19f9a056a05c5c509fa65af472a322abfee
Comment 1 Guilherme de Almeida Suckevicz 2021-11-29 14:58:45 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2027406]
Comment 6 Justin M. Forbes 2021-12-08 18:23:44 UTC 
This was fixed for Fedora with the 5.15 stable kernel rebases.
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