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Fencer Vulns
high 7.8

CVE-2021-37576 json

arch/powerpc/kvm/book3s_rtas.c in the Linux kernel through 5.13.5 on the powerpc platform allows KVM guest OS users to cause host OS memory…

published 2021-07-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24137

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

arch/powerpc/kvm/book3s_rtas.c in the Linux kernel through 5.13.5 on the powerpc platform allows KVM guest OS users to cause host OS memory corruption via rtas_args.nargs, aka CID-f62f3c20647e.

Patch / fix

  • linux linux_kernel 4.4.277, 4.9.277, 4.14.241, 4.19.199, 5.4.136, 5.10.54, 5.13.6
  • linux Debian 14, Debian 13, Debian 12 5.14.6-1

debian advisories DEBIAN-CVE-2021-37576

  • linux Ubuntu 18.04 LTS 4.15.0-159.167
  • linux Ubuntu 20.04 LTS 5.4.0-88.99
  • linux-ibm Ubuntu 20.04 LTS 5.4.0-1005.6
  • linux-hwe-5.4 Ubuntu 18.04 LTS 5.4.0-87.98~18.04.1
  • linux-dell300x Ubuntu 18.04 LTS 4.15.0-1028.33
  • linux-gcp-5.11 Ubuntu 20.04 LTS 5.11.0-1020.22~20.04.1
  • linux-hwe-5.11 Ubuntu 20.04 LTS 5.11.0-37.41~20.04.2
  • linux-hwe Ubuntu Pro 16.04 LTS 4.15.0-159.167~16.04.1

ubuntu advisories UBUNTU-CVE-2021-37576

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 7 3.10.0-1160.45.1.el7
  • perf RHEL 7 3.10.0-1160.45.1.el7
  • bpftool RHEL 7 3.10.0-1160.45.1.el7
  • python-perf RHEL 7 3.10.0-1160.45.1.el7
  • kernel-kdump RHEL 7 3.10.0-1160.45.1.el7
  • kernel-tools RHEL 7 3.10.0-1160.45.1.el7
  • kernel-tools-libs RHEL 7 3.10.0-1160.45.1.el7
  • kernel-bootwrapper RHEL 7 3.10.0-1160.45.1.el7

red hat advisories RHSA-2021:3801RHSA-2021:3768RHSA-2021:3766RHSA-2021:3725RHSA-2021:3436RHSA-2021:3447

  • kernel-syms SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.12.14-95.83.2
  • kernel-source SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.12.14-95.83.2
  • kernel-default SLES for SAP 12 SP4, SLES 12 SP4-LTSS, SLE Live Patching 12 SP4 +3 more 4.12.14-95.83.2
  • kernel-syms SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.78.1
  • kernel-source SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.78.1
  • kernel-default SLES for SAP 15, SLES 15-LTSS, SLE Live Patching 15 +3 more 4.12.14-150.78.1
  • kernel-vanilla SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.78.1
  • kernel-obs-build SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.78.2

suse advisories SUSE-SU-2021:3972-1SUSE-SU-2021:3969-1SUSE-SU-2021:3935-1SUSE-SU-2021:3929-1SUSE-SU-2021:3876-1SUSE-SU-2021:2846-1

  • kernel-source openSUSE Tumbleweed 5.14.6-1.4
  • kernel-source openSUSE Tumbleweed 6.6.17-1.1
  • kernel-default openSUSE Leap 15.3 4.12.14-197.102.2
  • kernel-vanilla openSUSE Leap 15.3 4.12.14-197.102.2
  • kernel-kvmsmall openSUSE Leap 15.3 4.12.14-197.102.2
  • kernel-zfcpdump openSUSE Leap 15.3 4.12.14-197.102.2
  • dtb-aarch64 openSUSE Leap 15.3 5.3.18-59.19.1
  • kernel-64kb openSUSE Leap 15.3 5.3.18-59.19.1

opensuse advisories openSUSE-SU-2024:10728-1openSUSE-SU-2024:13704-1openSUSE-SU-2021:3876-1openSUSE-SU-2021:2687-1openSUSE-SU-2021:1142-1openSUSE-SU-2021:2645-1

  • kernel Rocky Linux 8 4.18.0-305.17.1.el8_4

rocky linux advisories RLSA-2021:3447

  • kernel CBL-Mariner 2.0 5.10.78.1-1

azure linux advisories AZL-6579

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-37576 updated cvss 7.8

kernel: powerpc: KVM guest OS users can cause host OS memory corruption

  • Red Hat Enterprise Linux 7 perf, kernel, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-305.17.1.el8_4, kernel-debuginfo-common-aarch64 4.18.0-305.17.1.el8_4, kernel-debuginfo-common-ppc64le 4.18.0-305.17.1.el8_4
    fixed: vendor fix RHSA-2021:3447
  • Red Hat CodeReady Linux Builder EUS (v. 8.1) kernel-debuginfo-common-x86_64 4.18.0-147.54.2.el8_1, kernel-debuginfo-common-aarch64 4.18.0-147.54.2.el8_1, kernel-debuginfo-common-ppc64le 4.18.0-147.54.2.el8_1
    fixed: vendor fix RHSA-2021:3444
  • Red Hat CodeReady Linux Builder EUS (v. 8.2) kernel-debuginfo-common-x86_64 4.18.0-193.65.2.el8_2, kernel-debuginfo-common-aarch64 4.18.0-193.65.2.el8_2, kernel-debuginfo-common-ppc64le 4.18.0-193.65.2.el8_2
    fixed: vendor fix RHSA-2021:3446
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-305.17.1.el8_4, kernel 4.18.0-305.17.1.el8_4, bpftool 4.18.0-305.17.1.el8_4, kpatch-patch-4_18_0-305 1-5.el8, kernel-core 4.18.0-305.17.1.el8_4, kernel-tools 4.18.0-305.17.1.el8_4, +20 more
    fixed: vendor fix RHSA-2021:3447
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) perf 4.18.0-147.54.2.el8_1, kernel 4.18.0-147.54.2.el8_1, bpftool 4.18.0-147.54.2.el8_1, kernel-core 4.18.0-147.54.2.el8_1, kernel-tools 4.18.0-147.54.2.el8_1, python3-perf 4.18.0-147.54.2.el8_1, +25 more
    fixed: vendor fix RHSA-2021:3444
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) perf 4.18.0-193.65.2.el8_2, kernel 4.18.0-193.65.2.el8_2, bpftool 4.18.0-193.65.2.el8_2, kernel-core 4.18.0-193.65.2.el8_2, kernel-tools 4.18.0-193.65.2.el8_2, python3-perf 4.18.0-193.65.2.el8_2, +27 more
    fixed: vendor fix RHSA-2021:3446
  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-1160.45.1.el7, kernel 3.10.0-1160.45.1.el7, bpftool 3.10.0-1160.45.1.el7, python-perf 3.10.0-1160.45.1.el7, kernel-tools 3.10.0-1160.45.1.el7, kernel-tools-libs 3.10.0-1160.45.1.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.45.1.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.45.1.el7 Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-1160.45.1.el7, kernel 3.10.0-1160.45.1.el7, bpftool 3.10.0-1160.45.1.el7, python-perf 3.10.0-1160.45.1.el7, kernel-kdump 3.10.0-1160.45.1.el7, kernel-tools 3.10.0-1160.45.1.el7, +19 more
    fixed: vendor fix RHSA-2021:3801
show 19 more
  • Red Hat Enterprise Linux Server AUS (v. 7.3) perf 3.10.0-514.93.1.el7, kernel 3.10.0-514.93.1.el7, python-perf 3.10.0-514.93.1.el7, kernel-tools 3.10.0-514.93.1.el7, kernel-tools-libs 3.10.0-514.93.1.el7, kernel-abi-whitelists 3.10.0-514.93.1.el7, +1 more
    fixed: vendor fix RHSA-2021:3766
  • Red Hat Enterprise Linux Server AUS (v. 7.4) perf 3.10.0-693.94.1.el7, kernel 3.10.0-693.94.1.el7, python-perf 3.10.0-693.94.1.el7, kernel-tools 3.10.0-693.94.1.el7, kernel-tools-libs 3.10.0-693.94.1.el7, kernel-abi-whitelists 3.10.0-693.94.1.el7, +1 more
    fixed: vendor fix RHSA-2021:3725
  • Red Hat Enterprise Linux Server AUS (v. 7.6) perf 3.10.0-957.84.1.el7, kernel 3.10.0-957.84.1.el7, bpftool 3.10.0-957.84.1.el7, python-perf 3.10.0-957.84.1.el7, kernel-tools 3.10.0-957.84.1.el7, kernel-tools-libs 3.10.0-957.84.1.el7, +2 more
    fixed: vendor fix RHSA-2021:3812
  • Red Hat Enterprise Linux Server AUS (v. 7.7) perf 3.10.0-1062.59.1.el7, kernel 3.10.0-1062.59.1.el7, bpftool 3.10.0-1062.59.1.el7, python-perf 3.10.0-1062.59.1.el7, kernel-tools 3.10.0-1062.59.1.el7, kernel-tools-libs 3.10.0-1062.59.1.el7, +2 more
    fixed: vendor fix RHSA-2021:3987
  • Red Hat Enterprise Linux Server E4S (v. 7.6) perf 3.10.0-957.84.1.el7, kernel 3.10.0-957.84.1.el7, python-perf 3.10.0-957.84.1.el7, kernel-tools 3.10.0-957.84.1.el7, kpatch-patch-3_10_0-957_61_1 1-6.el7, kpatch-patch-3_10_0-957_61_2 1-6.el7, +13 more
    fixed: vendor fix RHSA-2021:3812
  • Red Hat Enterprise Linux Server E4S (v. 7.7) perf 3.10.0-1062.59.1.el7, kernel 3.10.0-1062.59.1.el7, bpftool 3.10.0-1062.59.1.el7, python-perf 3.10.0-1062.59.1.el7, kernel-tools 3.10.0-1062.59.1.el7, kpatch-patch-3_10_0-1062_40_1 1-6.el7, +12 more
    fixed: vendor fix RHSA-2021:3987
  • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-1160.45.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.45.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.45.1.el7
    fixed: vendor fix RHSA-2021:3801
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.3) kernel-debuginfo-common-x86_64 3.10.0-514.93.1.el7
    fixed: vendor fix RHSA-2021:3766
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) kernel-debuginfo-common-x86_64 3.10.0-693.94.1.el7
    fixed: vendor fix RHSA-2021:3725
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.84.1.el7
    fixed: vendor fix RHSA-2021:3812
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.59.1.el7
    fixed: vendor fix RHSA-2021:3987
  • Red Hat Enterprise Linux Server Optional E4S (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.84.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-957.84.1.el7
    fixed: vendor fix RHSA-2021:3812
  • Red Hat Enterprise Linux Server Optional E4S (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.59.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1062.59.1.el7
    fixed: vendor fix RHSA-2021:3987
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.84.1.el7
    fixed: vendor fix RHSA-2021:3812
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.59.1.el7
    fixed: vendor fix RHSA-2021:3987
  • Red Hat Enterprise Linux Server TUS (v. 7.6) perf 3.10.0-957.84.1.el7, kernel 3.10.0-957.84.1.el7, bpftool 3.10.0-957.84.1.el7, python-perf 3.10.0-957.84.1.el7, kernel-tools 3.10.0-957.84.1.el7, kernel-tools-libs 3.10.0-957.84.1.el7, +2 more
    fixed: vendor fix RHSA-2021:3812
  • Red Hat Enterprise Linux Server TUS (v. 7.7) perf 3.10.0-1062.59.1.el7, kernel 3.10.0-1062.59.1.el7, bpftool 3.10.0-1062.59.1.el7, python-perf 3.10.0-1062.59.1.el7, kernel-tools 3.10.0-1062.59.1.el7, kernel-tools-libs 3.10.0-1062.59.1.el7, +2 more
    fixed: vendor fix RHSA-2021:3987
  • Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-1160.45.1.el7, kernel 3.10.0-1160.45.1.el7, bpftool 3.10.0-1160.45.1.el7, python-perf 3.10.0-1160.45.1.el7, kernel-tools 3.10.0-1160.45.1.el7, kernel-tools-libs 3.10.0-1160.45.1.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.45.1.el7
    fixed: vendor fix RHSA-2021:3801
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 kernel-rt, kernel-rt-kvm, kernel-rt-trace, kernel-rt-debug-kvm, kernel-rt-trace-kvm Red Hat Enterprise Linux 8 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +6 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • openwall.com http://www.openwall.com/lists/oss-security/2021/07/27/2 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.