CVE-2021-20255

NameCVE-2021-20255
DescriptionA 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-2623-1
Debian Bugs984451

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
qemu (PTS)buster1:3.1+dfsg-8+deb10u8vulnerable
buster (security)1:3.1+dfsg-8+deb10u12vulnerable
bullseye1:5.2+dfsg-11+deb11u3vulnerable
bullseye (security)1:5.2+dfsg-11+deb11u2vulnerable
bookworm1:7.2+dfsg-7+deb12u5vulnerable
sid, trixie1:8.2.4+ds-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
qemusourcestretch1:2.8+dfsg-6+deb9u14DLA-2623-1
qemusource(unstable)1:8.1.0+ds-1984451

Notes

[bookworm] - qemu <postponed> (Minor issue, revisit when fixed upstream)
[bullseye] - qemu <postponed> (Minor issue, revisit when fixed upstream)
[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

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