CVE-2021-3416
QEMU: net: Infinite loop in loopback mode may lead to stack overflow
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · February 24, 2021
Updated · November 2, 2026
Description
A potential stack overflow via infinite loop issue was found in various NIC emulators of QEMU. 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.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 3.2CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L
CWE-835 · Loop with Unreachable Exit Condition