CVE-2022-50226

Kernel memory disclosure via partially overwritten SEV buffers

Published Jun 18, 2025 · Updated May 11, 2026

Information disclosure in the ccp driver in Linux allows local users to read uninitialized slab memory through certain SEV ioctl responses. The affected allocation path sizes a kmalloc buffer from the supplied length, while PSP firmware can return less data and leave the remaining bytes uncleared. Reachability requires local access to an applicable SEV ioctl and a length exceeding the firmware response, although the upstream record describes existing interfaces as safe.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the ccp driver in Linux allows local users to read uninitialized slab memory through certain SEV ioctl responses. The affected allocation path sizes a kmalloc buffer from the supplied length, while PSP firmware can return less data and leave the remaining bytes uncleared. Reachability requires local access to an applicable SEV ioctl and a length exceeding the firmware response, although the upstream record describes existing interfaces as safe.

The record

CVE
CVE-2022-50226
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record 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=4.16
  2. Affected versionversion=e799035609e1526761aa2f896a974b233d04d36d <13dc15a3f5fd7f884e4bfa8c011a0ae868df12ae
  3. Affected versionversion=e799035609e1526761aa2f896a974b233d04d36d <4c5300f6f5e18b11c02a92f136e69b98fddba15e
  4. Affected versionversion=e799035609e1526761aa2f896a974b233d04d36d <caa395aa16e7c9193fd7fa6cde462dd8229d4953
  5. Affected versionversion=e799035609e1526761aa2f896a974b233d04d36d <e11fb0a3a39bb42da35fa662c46ce7391f277436
  6. Affected versionversion=e799035609e1526761aa2f896a974b233d04d36d <f2a920daa780956b987c14b9f23de7c3c8915bf2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.16; version=e799035609e1526761aa2f896a974b233d04d36d <13dc15a3f5fd7f884e4bfa8c011a0ae868df12ae; version=e799035609e1526761aa2f896a974b233d04d36d <4c5300f6f5e18b11c02a92f136e69b98fddba15e; version=e799035609e1526761aa2f896a974b233d04d36d <caa395aa16e7c9193fd7fa6cde462dd8229d4953; version=e799035609e1526761aa2f896a974b233d04d36d <e11fb0a3a39bb42da35fa662c46ce7391f277436; version=e799035609e1526761aa2f896a974b233d04d36d <f2a920daa780956b987c14b9f23de7c3c8915bf2

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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