CVE-2021-43056 : An issue was discovered in the Linux kernel for powerpc before 5.14.15. It allow

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 2021-10-28 04:15:08

Updated 2021-11-28 23:31:49

Source MITRE

View at NVD, CVE.org

Products affected by CVE-2021-43056

Linux » Linux Kernel
Versions from including (>=) 5.2 and before (<) 5.4.15
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 33
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 34
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 35
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-43056

EPSS FAQ

0.05%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 12 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-43056

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.9	MEDIUM	AV:L/AC:L/Au:N/C:N/I:N/A:C	3.9	6.9	NIST
Access Vector: Local Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete
5.5	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	1.8	3.6	NIST
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

References for CVE-2021-43056

https://lore.kernel.org/linuxppc-dev/87pmrtbbdt.fsf@mpe.ellerman.id.au/T/#u

Linux kernel: powerpc: KVM guest can trigger host crash on Power8
Patch;Vendor Advisory
https://git.kernel.org/linus/cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337

kernel/git/torvalds/linux.git - Linux kernel source tree
Patch;Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AA7EAPPKWG4LMTQQLNNSKATY6ST2KQFE/

[SECURITY] Fedora 33 Update: kernel-5.14.15-100.fc33 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15

Release Notes;Vendor Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RRAIS3PG4EV5WFLYESR6FXWM4BJJGWVA/

[SECURITY] Fedora 35 Update: kernel-5.14.15-300.fc35 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BBM4FP3IT3JZ2O7EBS7TEOG657N4ZGRE/

[SECURITY] Fedora 34 Update: kernel-5.14.15-200.fc34 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/28/1

oss-security - Re: Linux kernel: powerpc: KVM guest can trigger host crash on Power8
Mailing List;Patch;Third Party Advisory

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Vulnerability Details : CVE-2021-43056

Products affected by CVE-2021-43056

Exploit prediction scoring system (EPSS) score for CVE-2021-43056

CVSS scores for CVE-2021-43056

References for CVE-2021-43056