What is CVE-2021-43056?

CVE-2021-43056 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10. CVE-2021-43056 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-43056?

CVE-2021-43056 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-43056?

No patch is currently available for CVE-2021-43056. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-43056 actively exploited?

CVE-2021-43056 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-43056

Medium

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.

Package Linux Kernel

Published 2021-10-28

Last modified 2024-11-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

The following references provide additional information about CVE-2021-43056 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel.org
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15

Release Notes Vendor Advisory
Lists
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AA7EAPPKWG4LMTQQLNNSKATY6ST2KQFE/
Lists
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBM4FP3IT3JZ2O7EBS7TEOG657N4ZGRE/
Lists
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRAIS3PG4EV5WFLYESR6FXWM4BJJGWVA/
Kernel.org
https://lore.kernel.org/linuxppc-dev/87pmrtbbdt.fsf%40mpe.ellerman.id.au/T/#u
Kernel patch commit
http://www.openwall.com/lists/oss-security/2021/10/28/1
Patch
Kernel patch commit
https://git.kernel.org/linus/cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337
Patch

Details

CVE ID CVE-2021-43056

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2021-10-28

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-43056?

CVE-2021-43056 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . CVE-2021-43056 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-43056?

CVE-2021-43056 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-43056?

No patch is currently available for CVE-2021-43056. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-43056 actively exploited?

No — CVE-2021-43056 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.