| Name | CVE-2021-3593 |
| Description | An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0. |
| 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-2970-1, DLA-3362-1 |
| Debian Bugs | 989994 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libslirp (PTS) | bullseye | 4.4.0-1+deb11u2 | fixed |
| bookworm | 4.7.0-1 | fixed |
| sid, trixie | 4.8.0-1 | fixed |
| 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+deb12u6 | fixed |
| trixie | 1:8.2.4+ds-1 | fixed |
| sid | 1:9.0.2+ds-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/93e645e72a056ec0b2c16e0299fc5c6b94e4ca17 (v4.6.0)
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/de71c15de66ba9350bf62c45b05f8fbff166517b (v4.6.0)
qemu 1:4.1-2 switched to system libslirp, marking that version as fixed.