CVEvulnerability

CVE-2021-43056

5.5 MEDIUM Published 2021-10-28 Modified 2026-06-17 Official page ↗

Status: Modified
Published: 2021-10-28
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected]): 4.9 MEDIUM — AV:L/AC:L/Au:N/C:N/I:N/A:C

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.

Affected configurations

• linux linux kernel (>= 5.2 < 5.4.15) • fedoraproject fedora 33 • fedoraproject fedora 34 • fedoraproject fedora 35

References

http://www.openwall.com/lists/oss-security/2021/10/28/1 Mailing List, Patch, Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15 Release Notes, Vendor Advisory
https://git.kernel.org/linus/cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337 Patch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AA7EAPPKWG4LMTQQLNNSKATY6ST2KQFE/ lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBM4FP3IT3JZ2O7EBS7TEOG657N4ZGRE/ lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRAIS3PG4EV5WFLYESR6FXWM4BJJGWVA/ lists.fedoraproject.org
https://lore.kernel.org/linuxppc-dev/87pmrtbbdt.fsf%40mpe.ellerman.id.au/T/#u lore.kernel.org
http://www.openwall.com/lists/oss-security/2021/10/28/1 Mailing List, Patch, Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15 Release Notes, Vendor Advisory
https://git.kernel.org/linus/cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337 Patch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AA7EAPPKWG4LMTQQLNNSKATY6ST2KQFE/ lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBM4FP3IT3JZ2O7EBS7TEOG657N4ZGRE/ lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRAIS3PG4EV5WFLYESR6FXWM4BJJGWVA/ lists.fedoraproject.org
https://lore.kernel.org/linuxppc-dev/87pmrtbbdt.fsf%40mpe.ellerman.id.au/T/#u lore.kernel.org