NULL pointer dereference in Qemu
CVE-2021-4158
A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (31.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.1% 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
- Qemu
- Red Hat Enterprise Linux — versions 9.0
- Qemu — versions Affects v6.0.0 and above.
Weakness classification (CWE)
References
- gitlab.com/qemu-project/qemu/-/issues/770 (Exploit, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- access.redhat.com/security/cve/CVE-2021-4158 (Third Party Advisory)
- www.mail-archive.com/qemu-devel@nongnu.org/msg857944.html (Patch, Third Party Advisory)
- gitlab.com/qemu-project/qemu/-/commit/9bd6565ccee68f72d5012e24646e12a1c662827e (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-4158?
- CVE-2021-4158 is a medium-severity vulnerability in Qemu, classified under NULL Pointer Dereference. CVSS score: 6.0/10. Published 2022-08-24.
- How severe is CVE-2021-4158?
- Medium severity. CVSS v3 base score is 6.0 out of 10.