CVE-2021-3527

NameCVE-2021-3527
DescriptionA flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2753-1
NVD severitylow
Debian Bugs988157

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
qemu (PTS)stretch1:2.8+dfsg-6+deb9u9vulnerable
stretch (security)1:2.8+dfsg-6+deb9u16fixed
buster, buster (security)1:3.1+dfsg-8+deb10u8vulnerable
bullseye1:5.2+dfsg-11fixed
bullseye (security)1:5.2+dfsg-11+deb11u1fixed
bookworm, sid1:6.1+dfsg-6fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
qemusourcestretch1:2.8+dfsg-6+deb9u15DLA-2753-1
qemusource(unstable)1:5.2+dfsg-11988157

Notes

[buster] - qemu <no-dsa> (Minor issue)
Initial patchset: https://lists.nongnu.org/archive/html/qemu-devel/2021-05/msg00564.html
Revisited: https://lists.nongnu.org/archive/html/qemu-devel/2021-05/msg01372.html
https://lists.nongnu.org/archive/html/qemu-devel/2021-05/msg01373.html

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