| Name | CVE-2021-3748 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2970-1, DLA-3099-1, DSA-4980-1 |
| Debian Bugs | 993401 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| qemu (PTS) | bullseye | 1:5.2+dfsg-11+deb11u3 | fixed |
| bullseye (security) | 1:5.2+dfsg-11+deb11u5 | fixed | |
| bookworm | 1:7.2+dfsg-7+deb12u16 | fixed | |
| bookworm (security) | 1:7.2+dfsg-7+deb12u15 | fixed | |
| trixie | 1:10.0.3+ds-0+deb13u1 | fixed | |
| trixie (security) | 1:10.0.2+ds-2+deb13u1 | fixed | |
| forky, sid | 1:10.1.2+ds-1 | 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+deb9u17 | DLA-2970-1 | ||
| qemu | source | buster | 1:3.1+dfsg-8+deb10u9 | DLA-3099-1 | ||
| qemu | source | bullseye | 1:5.2+dfsg-11+deb11u1 | DSA-4980-1 | ||
| qemu | source | (unstable) | 1:6.1+dfsg-6 | 993401 |
https://bugzilla.redhat.com/show_bug.cgi?id=1998514
https://gitlab.com/qemu-project/qemu/-/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6 (v6.2.0-rc0)
When fixing this issue make sure to not open CVE-2022-26353