CVE-2021-3527 — Allocation of Resources Without Limits or Throttling in Qemu
Severity
5.5MEDIUMNVD
OSV2.3
EPSS
0.0%
top 92.14%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedMay 26
Latest updateMay 24
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 …
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6
Affected Packages6 packages
Also affects: Debian Linux 10.0, 9.0, Enterprise Linux 8.0
Patches
🔴Vulnerability Details
3📋Vendor Advisories
4Microsoft▶
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↗2021-05-11
Debian▶
CVE-2021-3527: qemu - A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB pac...↗2021