Vulnerability Details : 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 malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process.
Vulnerability category: Memory CorruptionExecute codeDenial of service
Products affected by CVE-2021-3748
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_advanced_virtualization_eus:8.4:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:21.10:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
Threat overview for CVE-2021-3748
Top countries where our scanners detected CVE-2021-3748
Top open port discovered on systems with this issue
53
IPs affected by CVE-2021-3748 17,204
Threat actors abusing to this issue?
Yes
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affected by CVE-2021-3748!
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Exploit prediction scoring system (EPSS) score for CVE-2021-3748
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 12 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-3748
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.9
|
MEDIUM | AV:L/AC:M/Au:N/C:C/I:C/A:C |
3.4
|
10.0
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H |
0.8
|
6.0
|
NIST |
CWE ids for CVE-2021-3748
-
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.Assigned by:
- nvd@nist.gov (Primary)
- secalert@redhat.com (Secondary)
References for CVE-2021-3748
-
https://ubuntu.com/security/CVE-2021-3748
CVE-2021-3748 | UbuntuPatch;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
[SECURITY] [DLA 3099-1] qemu security updateMailing List;Third Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=1998514
1998514 – (CVE-2021-3748) CVE-2021-3748 QEMU: virtio-net: heap use-after-free in virtio_net_receive_rcuIssue Tracking;Patch;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html
[SECURITY] [DLA 2970-1] qemu security updateMailing List;Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20220425-0004/
CVE-2021-3748 QEMU Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
-
https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html
[PATCH] virtio-net: fix use after unmap/free for sgMailing List;Patch;Third Party Advisory
-
https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6
virtio-net: fix use after unmap/free for sg · qemu/qemu@bedd7e9 · GitHubPatch;Third Party Advisory
-
https://security.gentoo.org/glsa/202208-27
QEMU: Multiple Vulnerabilities (GLSA 202208-27) — Gentoo securityThird Party Advisory
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