Vulnerability in Linux Kernel
CVE-2021-43056
An issue was discovered in the Linux kernel for powerpc before 5.14.15. It allows a malicious KVM guest to crash the host, when the host is running on Power8, due to an arch/powerpc/kvm/book3s_hv_rmhandlers.S implementation bug in the handling of the SRR1 register values.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.3% 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
- Fedoraproject Fedora — versions 33, 34, 35
References
- git.kernel.org/linus/cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337 (Patch, Vendor Advisory)
- lore.kernel.org/linuxppc-dev/87pmrtbbdt.fsf@mpe.ellerman.id.au/T/
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15 (Release Notes, Vendor Advisory)
- www.openwall.com/lists/oss-security/2021/10/28/1 (mailing-list, Patch, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2021-43056?
- CVE-2021-43056 is a medium-severity vulnerability in Linux Kernel. CVSS score: 5.5/10. Published 2021-10-28.
- How severe is CVE-2021-43056?
- Medium severity. CVSS v3 base score is 5.5 out of 10.