| Name | CVE-2021-20196 |
| Description | A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more) |
| NVD severity | low |
| Debian Bugs | 984453 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| qemu (PTS) | stretch | 1:2.8+dfsg-6+deb9u9 | vulnerable |
| stretch (security) | 1:2.8+dfsg-6+deb9u16 | vulnerable | |
| buster, buster (security) | 1:3.1+dfsg-8+deb10u8 | vulnerable | |
| bullseye | 1:5.2+dfsg-11 | vulnerable | |
| bullseye (security) | 1:5.2+dfsg-11+deb11u1 | vulnerable | |
| bookworm | 1:6.1+dfsg-6 | vulnerable | |
| sid | 1:6.1+dfsg-7 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| qemu | source | (unstable) | (unfixed) | 984453 |
[bullseye] - qemu <postponed> (Minor issue, revisit when fixed upstream)
[buster] - qemu <postponed> (Fix along in future DSA)
[stretch] - qemu <postponed> (Fix along in future DLA)
https://bugzilla.redhat.com/show_bug.cgi?id=1919210
https://bugs.launchpad.net/qemu/+bug/1912780
https://gitlab.com/qemu-project/qemu/-/issues/338
https://lists.nongnu.org/archive/html/qemu-devel/2021-01/msg05986.html