CVE-2021-3392

Severity: low (CVSS 3.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-03-23 · updated 2026-06-17
Weakness: CWE-416

Description

A use-after-free flaw was found in the MegaRAID emulator of QEMU. This issue occurs while processing SCSI I/O requests in the case of an error mptsas_free_request() that does not dequeue the request object 'req' from a pending requests queue. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. Versions between 2.10.0 and 5.2.0 are potentially affected.

Affected products

Debian Linux: 9.0, 10.0
Fedoraproject Fedora: 33
QEMU: from 2.10.0 through 5.2.0

References

https://bugs.launchpad.net/qemu/+bug/1914236
https://bugzilla.redhat.com/show_bug.cgi?id=1924042
https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
https://security.netapp.com/advisory/ntap-20210507-0001/
https://bugs.launchpad.net/qemu/+bug/1914236
https://bugzilla.redhat.com/show_bug.cgi?id=1924042
https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
https://security.netapp.com/advisory/ntap-20210507-0001/

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