CVE-2021-3527
First published: Fri Apr 30 2021(Updated: )
A flaw was found in the USB redirection support (usb-redir) of QEMU. More specifically, usb-host and usb-redirect try to batch bulk transfers by combining many small USB packets into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk sending is used in usbredir_handle_bulk_data() to dynamically allocate a variable length array (VLA) on the stack. Since the total size is not bounded, a malicious guest could be able to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU qemu | <=6.0.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| debian/qemu | 1:5.2+dfsg-11+deb11u3 1:5.2+dfsg-11+deb11u2 1:7.2+dfsg-7+deb12u7 1:9.2.0+ds-2 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1955695
- https://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524c
- https://gitlab.com/qemu-project/qemu/-/commit/7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986
- https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
- https://security.gentoo.org/glsa/202208-27
- https://security.netapp.com/advisory/ntap-20210708-0008/
- https://www.openwall.com/lists/oss-security/2021/05/05/5
- https://launchpad.net/bugs/cve/CVE-2021-3527
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1956201
- https://lists.nongnu.org/archive/html/qemu-devel/2021-05/msg00564.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1955695#c5
- https://lists.nongnu.org/archive/html/qemu-devel/2021-05/msg01372.html
- https://lists.nongnu.org/archive/html/qemu-devel/2021-05/msg01373.html
- https://security-tracker.debian.org/tracker/CVE-2021-3527
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3527
- https://nvd.nist.gov/vuln/detail/CVE-2021-3527
- https://ubuntu.com/security/CVE-2021-3527
Frequently Asked Questions
What is CVE-2021-3527?
CVE-2021-3527 is a vulnerability in the USB redirector device (usb-redir) of QEMU.
How does CVE-2021-3527 affect QEMU?
CVE-2021-3527 allows an attacker to cause a stack-based buffer overflow in QEMU.
What is the severity of CVE-2021-3527?
CVE-2021-3527 has a severity rating of 5.5 (Medium).
Which software versions are affected by CVE-2021-3527?
QEMU version 6.0.0 and Red Hat Enterprise Linux 8.0 are affected by CVE-2021-3527.
How can I fix CVE-2021-3527?
To fix CVE-2021-3527, update QEMU to version 6.0.0 or apply the recommended patches for affected software.
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