CVE-2020-27821

Description

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.

CVSS Metrics

• v3.1•MEDIUM•Score: 6CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
• v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.04%• Percentile: 11%

Techniques & Countermeasures

• CWE-787•Out-of-bounds Write

  The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

• debian•debian_linux

  10.0

• qemu•qemu

  < 5.2.0

References (4)

• https://bugzilla.redhat.com/show_bug.cgi?id=1902651
• http://www.openwall.com/lists/oss-security/2020/12/16/6
• https://security.netapp.com/advisory/ntap-20210115-0006/
• https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html