7.5

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Qemu ≫ Qemu Version >= 0.10.0 < 6.2.0
Debian ≫ Debian Linux Version9.0
Debian ≫ Debian Linux Version10.0
Canonical ≫ Ubuntu Linux Version18.04 SwEditionlts
Canonical ≫ Ubuntu Linux Version20.04 SwEditionlts
Canonical ≫ Ubuntu Linux Version21.10
Fedoraproject ≫ Fedora Version34
Redhat ≫ Enterprise Linux Version8.0 SwEditionadvanced_virtualization
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.52% 0.404
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.5 0.8 6
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
nvd@nist.gov 6.9 3.4 10
AV:L/AC:M/Au:N/C:C/I:C/A:C
CWE-416 Use After Free

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
Third Party Advisory
Mailing List
https://security.gentoo.org/glsa/202208-27
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html
Third Party Advisory
Mailing List
https://bugzilla.redhat.com/show_bug.cgi?id=1998514
Patch
Third Party Advisory
Issue Tracking
https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6
Patch
Third Party Advisory
https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html
Patch
Third Party Advisory
Mailing List
https://security.netapp.com/advisory/ntap-20220425-0004/
Third Party Advisory
https://ubuntu.com/security/CVE-2021-3748
Patch
Third Party Advisory