CVE-2021-3748

CVSS V2 Medium 6.9 CVSS V3 High 8.8
Description
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.
Overview
  • CVE ID
  • CVE-2021-3748
  • Assigner
  • secalert@redhat.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2022-03-23T20:15:09
  • Last Modified Date
  • 2023-01-03T15:16:38
Weakness Enumerations
CWE URL
CWE-416 http://cwe.mitre.org/data/definitions/416.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* 1 OR 0.10.0 6.2.0
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* 1 OR
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* 1 OR
cpe:2.3:o:canonical:ubuntu_linux:21.10:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:* 1 OR
cpe:2.3:o:redhat:enterprise_linux_advanced_virtualization_eus:8.4:*:*:*:*:*:*:* 1 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:L/AC:M/Au:N/C:C/I:C/A:C
  • Access Vector
  • LOCAL
  • Access Compatibility
  • MEDIUM
  • Authentication
  • NONE
  • Confidentiality Impact
  • COMPLETE
  • Integrity Impact
  • COMPLETE
  • Availability Impact
  • COMPLETE
  • Base Score
  • 6.9
  • Severity
  • MEDIUM
  • Exploitability Score
  • 3.4
  • Impact Score
  • 10
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  • Attack Vector
  • LOCAL
  • Attack Compatibility
  • LOW
  • Privileges Required
  • LOW
  • User Interaction
  • NONE
  • Scope
  • CHANGED
  • Confidentiality Impact
  • HIGH
  • Availability Impact
  • HIGH
  • Base Score
  • 8.8
  • Base Severity
  • HIGH
  • Exploitability Score
  • 2
  • Impact Score
  • 6
References
Reference URL Reference Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1998514 Issue Tracking Patch Third Party Advisory
https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6 Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing List Third Party Advisory
https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html Mailing List Patch Third Party Advisory
https://security.gentoo.org/glsa/202208-27 Third Party Advisory
https://security.netapp.com/advisory/ntap-20220425-0004/ Third Party Advisory
https://ubuntu.com/security/CVE-2021-3748 Patch Third Party Advisory
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2021-3748
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3748
History
Created Old Value New Value Data Type Notes
2022-04-04 00:40:47 Added to TrackCVE
2022-12-06 13:07:55 2022-03-23T20:15Z 2022-03-23T20:15:09 CVE Published Date updated
2022-12-06 13:07:55 2022-10-26T13:36:12 CVE Modified Date updated
2022-12-06 13:07:55 Analyzed Vulnerability Status updated
2022-12-06 13:08:00 References updated
2023-01-03 15:13:32 Analyzed Undergoing Analysis Vulnerability Status updated
2023-01-03 16:15:11 2023-01-03T15:16:38 CVE Modified Date updated
2023-01-03 16:15:11 Undergoing Analysis Analyzed Vulnerability Status updated
2023-01-03 16:15:11 AV:L/AC:L/Au:N/C:C/I:C/A:C AV:L/AC:M/Au:N/C:C/I:C/A:C CVSS V2 vector_string updated
2023-01-03 16:15:11 LOW MEDIUM CVSS V2 access_complexity updated
2023-01-03 16:15:11 7.2 6.9 CVSS V2 baseScore updated
2023-01-03 16:15:11 HIGH MEDIUM CVSS V2 baseSeverity updated
2023-01-03 16:15:11 3.9 3.4 CVSS V2 exploitabilityScore updated