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TI-2020-16892 Aliases CVE-2020-27821GHSA-7p47-wfc3-mcqv

Out-of-bounds write in QEMU

Priority LOW 27CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 4 fixed, 4 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.

Why it matters now

EPSS 0.00364 30th percentileScored 2026-11-07
Fix Partial QEMU: 5.2.0Red Hat: 1 advisoryRed Hat: 4 fixed, 4 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—QEMUbefore 5.2.05.2.0Patch availableCNA
  • QEMU Vendor— Affected before 5.2.0 Fixed in 5.2.0 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*before 5.2.0VulnerableQEMU
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
  • cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* Versions before 5.2.0 Vulnerable ·QEMU
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian

Remediation

  • Fix · CNA QEMU Fixed in 5.2.0

Red Hat 1 advisory

  • RHSA-2021:1762 Released 2021-05-18 · Red Hat rating Moderate
    virt:rhel and virt-devel:rhel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) SLOF-20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418.src::virt-devel:rhel, hivex-1.3.18-20.module+el8.3.0+6423+e4cb6418.i686::virt-devel:rhel, hivex-devel-1.3.18-20.module+el8.3.0+6423+e4cb6418.i686::virt-devel:rhel +47
    • Red Hat Enterprise Linux AppStream (v. 8) SLOF-20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418.noarch::virt:rhel, SLOF-20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418.src::virt:rhel, hivex-1.3.18-20.module+el8.3.0+6423+e4cb6418.aarch64::virt:rhel +47

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8 Advanced VirtualizationAffectedNo fix yet
Red Hat OpenStack Platform 10 (Newton)AffectedNo fix planned: Out of support scope
Red Hat OpenStack Platform 13 (Queens)AffectedNo fix planned: Out of support scope
Advanced Virtualization CodeReady Builder for RHEL 8.3.1Fixed—
Advanced Virtualization for RHEL 8.3.1Fixed—
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:1762
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:1762
Not affected: 5 products
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8 Advanced Virtualization
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-27821
  2. 2026-10-03 Alias added: GHSA-7p47-wfc3-mcqv

References

Patch 1

Advisory 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences