CVE-2021-3748
Published: 31 August 2021
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.
Priority
Status
Package | Release | Status |
---|---|---|
qemu Launchpad, Ubuntu, Debian |
impish |
Released
(1:6.0+dfsg-2expubuntu1.2)
|
kinetic |
Released
(1:6.2+dfsg-2ubuntu5)
|
|
upstream |
Needs triage
|
|
trusty |
Not vulnerable
(code not present)
|
|
bionic |
Released
(1:2.11+dfsg-1ubuntu7.39)
|
|
focal |
Released
(1:4.2-3ubuntu6.21)
|
|
xenial |
Not vulnerable
(code not present)
|
|
hirsute |
Ignored
(end of life)
|
|
jammy |
Released
(1:6.2+dfsg-2ubuntu5)
|
|
Patches: upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=bedd7e93d01961fcb16a97ae45d93acf357e11f6 |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.5 |
Attack vector | Local |
Attack complexity | High |
Privileges required | High |
User interaction | None |
Scope | Changed |
Confidentiality | High |
Integrity impact | High |
Availability impact | High |
Vector | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H |