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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (36.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Qemu
- Debian Linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 33
- Qemu — versions between 2.10.0 and 5.2.0
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- bugs.launchpad.net/qemu/+bug/1914236 (Exploit, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/04/msg00009.html (mailing-list, Third Party Advisory)
- security.netapp.com/advisory/ntap-20210507-0001/ (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2022/09/msg00008.html (mailing-list, 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.