Vulnerability Intelligence Report
Improper memory handling in Linux KVM
CVE-2021-22543
An issue was discovered in Linux: KVM through Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks and can lead to pages being freed while still accessible by the VMM and guest. This allows users with the ability to start and control a VM to read/write random pages of memory and can result in local privilege escalation.
No Active Exploit Signals
CVSS Base Score
8.7
HIGH
EPSS Probability:0.66%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
—
Weaknesses (CWE)
CWE-119 ↗CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Linux Kernel | Linux Kernel | add6a0cd1c5ba51b201e1361b05a5df817083618 < f8be156be163a052a067306417cd0ff679068c97 (affected) |
Threat Intelligence Signals
EPSS Score
0.660%
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Google LLC · Vendor · USA |
| Reserved | 2021-01-05T00:00:00 |
| Published | 2021-05-26T10:30:10 |
| Patch Date | 2021-05-17 |
| Last Updated | 2024-09-16T23:26:05 |
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