Vulnerability in Linux Kernel
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (32.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Linux Kernel — versions 5.15
- Kernel — versions kernel 5.15 rc7
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Exploit, Patch, Third Party Advisory)
- lkml.org/lkml/2021/9/8/587 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-4032?
- CVE-2021-4032 is a medium-severity vulnerability in Linux Kernel, classified under Incomplete Cleanup. CVSS score: 4.4/10. Published 2022-01-21.
- How severe is CVE-2021-4032?
- Medium severity. CVSS v3 base score is 4.4 out of 10.
- Is CVE-2021-4032 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.