CVE-2021-3527

2021-05-2621:13:56

CWE-770

redhat

www.cve.org

6.5 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

14.2%

JSON

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.

CNA Affected

[
  {
    "product": "QEMU",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "all versions"
      }
    ]
  }
]