Use After Free in Qemu
CVE-2021-3392
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.
Vulnerability class: Use-After-Free
EPSS: 0.004 (36.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.2 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L.
Affected products
- Qemu
- Debian Debian_linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 33
- N/a Qemu — versions between 2.10.0 and 5.2.0
Weakness classification (CWE)
References
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (Exploit, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Third Party Advisory)
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3392?
- CVE-2021-3392 is a low-severity vulnerability in Qemu, classified under Use After Free. CVSS score: 3.2/10. Published 2021-03-23.
- How severe is CVE-2021-3392?
- Low severity. CVSS v3 base score is 3.2 out of 10.