A potential stack overflow via infinite loop issue was found in various NIC emulators of QEMU in versions up to and including 5.2.0. The issue occurs in loopback mode of a NIC wherein reentrant DMA checks get bypassed. A guest user/process may use this flaw to consume CPU cycles or crash the QEMU process on the host resulting in DoS scenario.
https://bugzilla.redhat.com/show_bug.cgi?id=1932827
https://www.openwall.com/lists/oss-security/2021/02/26/1
https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html
Source: MITRE
Published: 2021-03-18
Updated: 2022-01-04
Type: CWE-835
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: 6
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
Impact Score: 4
Exploitability Score: 1.5
Severity: MEDIUM