CVE-2020-8834

mediumpriority · track · 26EPSS 0.003 · 28 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.35% (28th) EPSS

CVSS 4.9 · medium

Is it mine?

63 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · redhat_csaf

EPSS · scored 2026-10-27

KVM 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")

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedkernel-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-abi-whitelists-0:4.14.0-115.26.1.el7a.noarch as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-alt-0:4.14.0-115.26.1.el7a.src as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-bootwrapper-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-debug-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-debug-debuginfo-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-debug-debuginfo-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-debug-devel-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-debuginfo-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-debuginfo-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-debuginfo-common-ppc64le-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-debuginfo-common-ppc64le-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-devel-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-doc-0:4.14.0-115.26.1.el7a.noarch as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-tools-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-tools-debuginfo-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-tools-debuginfo-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-tools-libs-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedkernel-tools-libs-devel-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedperf-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedperf-debuginfo-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedperf-debuginfo-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedpython-perf-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedpython-perf-debuginfo-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854
Fixedpython-perf-debuginfo-0:4.14.0-115.26.1.el7a.ppc64le as a component of Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2020:2854

cvss

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.9mediumAV:L/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 3.9 · impact 6.9

v3.16.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 2 · impact 4

v3.16.5mediumAV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.16.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:Hsecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:Hsecondary · security@ubuntu.comexploitability 2 · impact 4

v3.16mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.16mediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:Hsecondary · Red Hat Product Security US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-362USprimaryCWE-121USCWE-362USCWE-368USCWE-368US

affected products (63)

Products and version ranges known to be affected.

Linux kernel Linux kernel4.8 → unspecifiedenisa_euvdEU
Linux kernel Linux kernelunspecified → 4.18enisa_euvdEU
Canonical Ltd. Ubuntu≤ 18.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 16.04 LTSfstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.1fstec_bduRU
Novell Inc. SUSE Linux Enterprise High Availability≤ 12 SP5fstec_bduRU
Novell Inc. SUSE Linux Enterprise High Availability≤ 12 SP4fstec_bduRU
Novell Inc. SUSE Linux Enterprise High Availability≤ 15 SP1fstec_bduRU
Novell Inc. SUSE Linux Enterprise Live Patching≤ 12 SP4fstec_bduRU
Novell Inc. SUSE Linux Enterprise Live Patching≤ 12 SP5fstec_bduRU
Novell Inc. SUSE Linux Enterprise Module for Basesystem≤ 15 SP1fstec_bduRU
Novell Inc. SUSE Linux Enterprise Module for Development Tools≤ 15 SP1fstec_bduRU
Novell Inc. SUSE Linux Enterprise Module for Legacy Software≤ 15 SP1fstec_bduRU
Novell Inc. SUSE Linux Enterprise Module for Live Patching≤ 15 SP1fstec_bduRU
Novell Inc. SUSE Linux Enterprise Module for Open Buildservice Development Tools≤ 15 SP1fstec_bduRU
Novell Inc. SUSE Linux Enterprise Module for Public Cloud≤ 15 SP1fstec_bduRU
Novell Inc. SUSE Linux Enterprise Module for Realtime packages≤ 15 SP1fstec_bduRU
Novell Inc. SUSE Linux Enterprise Real Time Extension≤ 12 SP5fstec_bduRU
Novell Inc. SUSE Linux Enterprise Real Time Extension≤ 12 SP4fstec_bduRU
Novell Inc. SUSE Linux Enterprise Server for SAP Applications≤ 12 SP5fstec_bduRU

showing 20 of 63

advisories (1)

Vendor and ecosystem advisories describing this.

RHSA-2020:2854Red Hat Security Advisory: kernel-alt security and bug fix update2020-07-07csaf · redhat_csafUS
An update for kernel-alt is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu redhat_csaf NVD CVE.org MITRE

published 2020-04-09modified 2026-06-17

related (4,139)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2025-62215US	—OT critical	4.46% (91st)	KEV	2025-11-11
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Kernel allows an authorized attacker to elevate privileges locally.
CVE-2025-39964US	medium5.5OT critical	1.57% (75th)	KEV	2025-10-13
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is…
CVE-2025-2783US	—OT critical	9.24% (95th)	KEV	2025-03-26
Incorrect handle provided in unspecified circumstances in Mojo in Google Chrome on Windows prior to 134.0.6998.177 allowed a remote attacker to perform a sandbox escape via a malic…
CVE-2025-22224US	high8.2OT critical	1.56% (75th)	KEV	2025-03-04
VMware ESXi, and Workstation contain a TOCTOU (Time-of-Check Time-of-Use) vulnerability that leads to an out-of-bounds write. A malicious actor with local administrative privileges…
CVE-2023-36884US	—OT critical	99.4% (100th)	KEV	2023-07-11
Windows Search Remote Code Execution Vulnerability

+4134 more

references (26)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan