CVE-2021-3507

NameCVE-2021-3507
DescriptionA heap buffer overflow was found in the floppy disk emulator of QEMU up to 6.0.0 (including). It could occur in fdctrl_transfer_handler() in hw/block/fdc.c while processing DMA read data transfers from the floppy drive to the guest system. A privileged guest user could use this flaw to crash the QEMU process on the host resulting in DoS scenario, or potential information leakage from the host memory.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3099-1
Debian Bugs987410

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+deb10u11fixed
bullseye1:5.2+dfsg-11+deb11u3fixed
bullseye (security)1:5.2+dfsg-11+deb11u2vulnerable
bookworm1:7.2+dfsg-7+deb12u5fixed
trixie1:8.2.1+ds-1fixed
sid1:8.2.1+ds-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
qemusourcebuster1:3.1+dfsg-8+deb10u9DLA-3099-1
qemusourcebullseye1:5.2+dfsg-11+deb11u3
qemusource(unstable)1:7.1+dfsg-1987410

Notes

[stretch] - qemu <no-dsa> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=1951118
https://gitlab.com/qemu-project/qemu/-/commit/defac5e2fbddf8423a354ff0454283a2115e1367 (v7.1.0-rc0)
https://gitlab.com/qemu-project/qemu/-/commit/46609b90d9e3a6304def11038a76b58ff43f77bc (v7.1.0-rc0)

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