Vulnerability Details : 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.
Vulnerability category: Denial of service
Products affected by CVE-2021-3527
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*
- cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-3527
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 12 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-3527
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
2.1
|
LOW | AV:L/AC:L/Au:N/C:N/I:N/A:P |
3.9
|
2.9
|
NIST | |
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST |
CWE ids for CVE-2021-3527
-
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.Assigned by:
- nvd@nist.gov (Primary)
- secalert@redhat.com (Secondary)
References for CVE-2021-3527
-
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
[SECURITY] [DLA 3099-1] qemu security updateMailing List;Third Party Advisory
-
https://gitlab.com/qemu-project/qemu/-/commit/7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986
usb/redir: avoid dynamic stack allocation (CVE-2021-3527) (7ec54f9e) · Commits · QEMU / QEMU · GitLabPatch;Third Party Advisory
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https://www.openwall.com/lists/oss-security/2021/05/05/5
oss-security - CVE-2021-3527 QEMU: usb: unbounded stack allocation in usbredirMailing List;Patch;Third Party Advisory
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https://bugzilla.redhat.com/show_bug.cgi?id=1955695
1955695 – (CVE-2021-3527) CVE-2021-3527 QEMU: usb: unbounded stack allocation in usbredirIssue Tracking;Patch;Third Party Advisory
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https://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524c
usb: limit combined packets to 1 MiB (CVE-2021-3527) (05a40b17) · Commits · QEMU / QEMU · GitLabPatch;Third Party Advisory
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https://security.netapp.com/advisory/ntap-20210708-0008/
CVE-2021-3527 QEMU Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
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https://security.gentoo.org/glsa/202208-27
QEMU: Multiple Vulnerabilities (GLSA 202208-27) — Gentoo securityThird Party Advisory
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https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html
[SECURITY] [DLA 2753-1] qemu security updateMailing List;Third Party Advisory
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