In QEMU 4.2.0, a MemoryRegionOps object may lack read/write callback methods, leading to a NULL pointer dereference.
http://www.openwall.com/lists/oss-security/2020/07/02/1
https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html
https://lists.gnu.org/archive/html/qemu-devel/2020-06/msg09961.html
Source: MITRE
Published: 2020-07-02
Updated: 2021-02-24
Type: CWE-476
Base Score: 2.1
Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 3.9
Severity: LOW
Base Score: 2.3
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
Impact Score: 1.4
Exploitability Score: 0.8
Severity: LOW