CVE-2021-3527

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.

• CWE-770
• CWE-770

• https://bugzilla.redhat.com/show_bug.cgi?id=1955695Issue Tracking, Patch, Third Party Advisory
• https://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524cPatch, Third Party Advisory
• https://gitlab.com/qemu-project/qemu/-/commit/7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/09/msg00000.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202208-27Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210708-0008/Third Party Advisory
• https://www.openwall.com/lists/oss-security/2021/05/05/5Mailing List, Patch, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1955695Issue Tracking, Patch, Third Party Advisory
• https://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524cPatch, Third Party Advisory
• https://gitlab.com/qemu-project/qemu/-/commit/7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/09/msg00000.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202208-27Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210708-0008/Third Party Advisory
• https://www.openwall.com/lists/oss-security/2021/05/05/5Mailing List, Patch, Third Party Advisory

Published

May 26, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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