CVE-2021-28691

2021-06-2911:30:53

XEN

www.cve.org

7.7 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

12.7%

JSON

Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "versions": [
      {
        "lessThan": "4.12",
        "status": "unknown",
        "version": "unspecified",
        "versionType": "custom"
      },
      {
        "lessThan": "unspecified",
        "status": "affected",
        "version": "5.5.0",
        "versionType": "custom"
      },
      {
        "lessThan": "unspecified",
        "status": "unaffected",
        "version": "next of 5.12.2",
        "versionType": "custom"
      }
    ]
  }
]