CVE-2022-0516

Unauthorized memory writes via unrestricted SIDA memops

Published Mar 8, 2022 · Updated Aug 2, 2024

Improper access control in Linux kernel KVM before 5.17-rc4 allows local users to write memory through SIDA operations. The kvm_s390_guest_sida_op ioctl path accepts SIDA read and write operations for normal guests because it omits the required protected-guest check. Exploitation requires low-privileged local access to an s390 KVM host and permits unauthorized guest-memory writes without user interaction.

CVSS severity7.8
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Linux kernel KVM before 5.17-rc4 allows local users to write memory through SIDA operations. The kvm_s390_guest_sida_op ioctl path accepts SIDA read and write operations for normal guests because it omits the required protected-guest check. Exploitation requires low-privileged local access to an s390 KVM host and permits unauthorized guest-memory writes without user interaction.

The record

CVE
CVE-2022-0516
Published
Mar 8, 2022
Updated
Aug 2, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-200, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 8, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Linux kernel versions prior to 5.17-rc4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux kernel versions prior to 5.17-rc4

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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