| Name | CVE-2016-9921 |
| Description | Quick emulator (Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to a divide by zero issue. It could occur while copying VGA data when cirrus graphics mode was set to be VGA. A privileged user inside guest could use this flaw to crash the Qemu process instance on the host, resulting in DoS. |
| 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-1497-1, DLA-764-1, DLA-765-1 |
| Debian Bugs | 847960 |
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+deb11u2 | fixed | |
| bookworm | 1:7.2+dfsg-7+deb12u7 | fixed | |
| trixie | 1:9.1.1+ds-5 | fixed | |
| sid | 1:9.1.2+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 | wheezy | 1.1.2+dfsg-6+deb7u19 | DLA-764-1 | ||
| qemu | source | jessie | 1:2.1+dfsg-12+deb8u7 | DLA-1497-1 | ||
| qemu | source | (unstable) | 1:2.8+dfsg-1 | 847960 | ||
| qemu-kvm | source | wheezy | 1.1.2+dfsg-6+deb7u19 | DLA-765-1 | ||
| qemu-kvm | source | (unstable) | (unfixed) |
https://lists.gnu.org/archive/html/qemu-devel/2016-12/msg00442.html
https://bugzilla.redhat.com/show_bug.cgi?id=1334398
Fixed by: http://git.qemu.org/?p=qemu.git;a=commit;h=4299b90e9ba9ce5ca9024572804ba751aa1a7e70 (v2.8.0-rc3)
CVE for the "'cirrus_get_bpp' returns zero(0), which could lead to a divide by zero" issue.