CVE-2021-20257
Published: 23 February 2021
An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
qemu Launchpad, Ubuntu, Debian |
bionic |
Released
(1:2.11+dfsg-1ubuntu7.37)
|
| focal |
Released
(1:4.2-3ubuntu6.17)
|
|
| groovy |
Released
(1:5.0-5ubuntu9.9)
|
|
| hirsute |
Not vulnerable
(1:5.2+dfsg-9ubuntu3)
|
|
| impish |
Not vulnerable
(1:5.2+dfsg-9ubuntu3)
|
|
| jammy |
Not vulnerable
(1:5.2+dfsg-9ubuntu3)
|
|
| kinetic |
Not vulnerable
(1:5.2+dfsg-9ubuntu3)
|
|
| lunar |
Not vulnerable
(1:5.2+dfsg-9ubuntu3)
|
|
| trusty |
Needed
|
|
| upstream |
Needs triage
|
|
| xenial |
Needed
|
|
|
Patches: upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=3de46e6fc489c52c9431a8a832ad8170a7569bd8 |
||
|
qemu-kvm Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| lunar |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Does not exist
|
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.5 |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Changed |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |