CVE-2021-3527

Name
CVE-2021-3527
Description
A 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.
NVD Severity
medium
Other trackers
Mailing lists
Exploits
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
MISC https://www.openwall.com/lists/oss-security/2021/05/05/5
MISC https://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524c
MISC https://bugzilla.redhat.com/show_bug.cgi?id=1955695
MISC https://gitlab.com/qemu-project/qemu/-/commit/7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* qemu >= None < 2021-05-05

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
qemu 3.13-community 5.2.0-r3 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
qemu 3.10-main 4.0.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
qemu edge-community 6.1.0-r1 Natanael Copa <ncopa@alpinelinux.org> fixed
qemu 3.14-community 6.0.0-r5 Natanael Copa <ncopa@alpinelinux.org> fixed