Use After Free in Qemu
CVE-2021-3748
A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A mal…
Vulnerability class: Use-After-Free
EPSS: 0.005 (40.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Qemu
- Canonical Ubuntu_linux — versions 18.04, 20.04, 21.10
- Debian Debian_linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 34
- Redhat Enterprise_linux — versions 8.0
- Redhat Enterprise_linux_advanced_virtualization_eus — versions 8.4
- N/a Qemu (Virtio-net) — versions Affects qemu v0.10.0 and above, Fixed In – v6.2.0-rc0 and above.
Weakness classification (CWE)
References
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (Patch, Mailing List, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3748?
- CVE-2021-3748 is a high-severity vulnerability in Qemu, classified under Use After Free. CVSS score: 7.5/10. Published 2022-03-23.
- How severe is CVE-2021-3748?
- High severity. CVSS v3 base score is 7.5 out of 10.