| Name | CVE-2021-20203 |
| Description | An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2623-1, DLA-3099-1 |
| Debian Bugs | 984452 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| qemu (PTS) | buster | 1:3.1+dfsg-8+deb10u8 | vulnerable |
| buster (security) | 1:3.1+dfsg-8+deb10u12 | fixed |
| bullseye | 1:5.2+dfsg-11+deb11u3 | fixed |
| bullseye (security) | 1:5.2+dfsg-11+deb11u2 | vulnerable |
| bookworm | 1:7.2+dfsg-7+deb12u5 | fixed |
| trixie | 1:8.2.1+ds-2 | fixed |
| sid | 1:8.2.2+ds-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| qemu | source | stretch | 1:2.8+dfsg-6+deb9u14 | | DLA-2623-1 | |
| qemu | source | buster | 1:3.1+dfsg-8+deb10u9 | | DLA-3099-1 | |
| qemu | source | bullseye | 1:5.2+dfsg-11+deb11u3 | | | |
| qemu | source | (unstable) | 1:6.2+dfsg-1 | | | 984452 |
Notes
https://bugs.launchpad.net/qemu/+bug/1913873
https://gitlab.com/qemu-project/qemu/-/issues/308
https://bugs.launchpad.net/qemu/+bug/1890152
https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg07935.html
Fixed by: https://gitlab.com/qemu-project/qemu/-/commit/d05dcd94aee88728facafb993c7280547eb4d645 (v6.2.0-rc3)