CVE-2021-43056 Information

Description

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.

CVSS Vector

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

Reference

https://git.kernel.org/linus/cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337 https://lore.kernel.org/linuxppc-dev/87pmrtbbdt.fsf@mpe.ellerman.id.au/T/#u https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15 http://www.openwall.com/lists/oss-security/2021/10/28/1 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BBM4FP3IT3JZ2O7EBS7TEOG657N4ZGRE/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AA7EAPPKWG4LMTQQLNNSKATY6ST2KQFE/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RRAIS3PG4EV5WFLYESR6FXWM4BJJGWVA/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.5