CVE-2020-8834

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Summary

CVECVE-2020-8834
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-04-09 22:15:00 UTC
Updated2022-10-07 15:43:00 UTC
DescriptionKVM in the Linux kernel on Power8 processors has a conflicting use of HSTATE_HOST_R1 to store r1 state in kvmppc_hv_entry plus in kvmppc_{save,restore}_tm, leading to a stack corruption. Because of this, an attacker with the ability run code in kernel space of a guest VM can cause the host kernel to panic. There were two commits that, according to the reporter, introduced the vulnerability: f024ee098476 ("KVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures") 87a11bb6a7f7 ("KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode") The former landed in 4.8, the latter in 4.17. This was fixed without realizing the impact in 4.18 with the following three commits, though it's believed the first is the only strictly necessary commit: 6f597c6b63b6 ("KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()") 7b0e827c6970 ("KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm") 009c872a8bc4 ("KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file")

Risk And Classification

Problem Types: CWE-362

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Canonical Ubuntu Linux 16.04 All All All
Operating System Canonical Ubuntu Linux 18.04 All All All
Operating System Canonical Ubuntu Linux 16.04 All All All
Operating System Canonical Ubuntu Linux 18.04 All All All
Hardware Ibm Power8 - All All All
Hardware Ibm Power8 - All All All
Operating System Linux Linux Kernel - All All All
Operating System Linux Linux Kernel - All All All
Operating System Opensuse Leap 15.1 All All All

References

ReferenceSourceLinkTags
oss-security - CVE-2020-8834: Linux kernel Power8 conflicting use of HSTATE_HOST_R1 vulnerability CONFIRM www.openwall.com Mailing List, Third Party Advisory
[security-announce] openSUSE-SU-2020:0543-1: important: Security update SUSE lists.opensuse.org
USN-4318-1: Linux kernel vulnerabilities | Ubuntu security notices | Ubuntu UBUNTU usn.ubuntu.com Third Party Advisory
Bug #1867717 “PPC: KVM: Book3S HV: Fix conflicting use of HSTATE...” : Bugs : linux package : Ubuntu CONFIRM bugs.launchpad.net Exploit, Third Party Advisory
USN-4318-1: Linux kernel vulnerabilities | Ubuntu security notices UBUNTU usn.ubuntu.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

LEGACY: Gustavo Romero

LEGACY: Paul Mackerras

Legacy QID Mappings

  • 750691 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2020:1141-1)
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