| Name | CVE-2021-20255 |
| Description | A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator of QEMU. This issue occurs while processing controller commands due to a DMA reentry issue. This flaw allows a guest user or process to consume CPU cycles or 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 advisories/code/issues, web search, more) |
| References | DLA-2623-1 |
| Debian Bugs | 984451 |
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+deb10u9 | vulnerable |
| bullseye (security), bullseye | 1:5.2+dfsg-11+deb11u2 | vulnerable |
| bookworm, sid | 1:7.2+dfsg-2 | vulnerable |
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 | (unstable) | (unfixed) | | | 984451 |
Notes
[bullseye] - qemu <postponed> (Minor issue)
[buster] - qemu <postponed> (Minor issue, waiting for sanctioned patch, fixed in stretch-lts)
https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg06098.html
https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Feepro100_stackoverflow1
No sanctioned upstream patch as of 2022-11-08