hw/net/xgmac.c in the XGMAC Ethernet controller in QEMU before 07-20-2020 has a buffer overflow. This occurs during packet transmission and affects the highbank and midway emulated machines. A guest user or process could use this flaw to crash the QEMU process on the host, resulting in a denial of service or potential privileged code execution. This was fixed in commit 5519724a13664b43e225ca05351c60b4468e4555.
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=5519724a13664b43e225ca05351c60b4468e4555
http://www.openwall.com/lists/oss-security/2020/07/22/1
https://lists.nongnu.org/archive/html/qemu-devel/2020-07/msg03497.html
https://lists.nongnu.org/archive/html/qemu-devel/2020-07/msg05745.html
https://usn.ubuntu.com/4467-1/
https://www.debian.org/security/2020/dsa-4760
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00024.html
Source: MITRE
Published: 2020-07-28
Updated: 2022-09-30
Type: CWE-787
Base Score: 4.4
Vector: AV:L/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 3.4
Severity: MEDIUM
Base Score: 5.3
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
Impact Score: 3.7
Exploitability Score: 1.1
Severity: MEDIUM