CVE-2022-50265

Service interruption via lockless KCM state access

Published Sep 15, 2025 · Updated Sep 15, 2025

A data race in the Linux kernel KCM subsystem allows local users to interrupt service through concurrent receive operations. kcm_rfree reads rx_wait without READ_ONCE while KCM receive paths write the same one-byte state without WRITE_ONCE, allowing its value to change during socket-buffer release. Low-privilege local access is required, and the published consequence is limited to availability interruption.

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

What happened

A data race in the Linux kernel KCM subsystem allows local users to interrupt service through concurrent receive operations. kcm_rfree reads rx_wait without READ_ONCE while KCM receive paths write the same one-byte state without WRITE_ONCE, allowing its value to change during socket-buffer release. Low-privilege local access is required, and the published consequence is limited to availability interruption.

The record

CVE
CVE-2022-50265
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.6
  2. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <0c745b5141a45a076f1cb9772a399f7ebcb0948a
  3. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <2733fb2ad5bfbe6538f2f93a21f2504e3dba9d6a
  4. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <62086d1c4602e4f2ec07b975165afc2ed0ff1be9
  5. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <663682cd3192dd4f3547b7890a4391c72441001d
  6. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <9ae47f11493509cde707af8ecc7eee04c8b8e635
  7. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <dbc3a0b917c4f75292b1c0819c188e40fd3c8924
  8. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <e2a28807b1ceaa309164b92c38d73d12feea33df
  9. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <f1f7122bb2ef056afc6f91ce4c35ab6df1207c8d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.6; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <0c745b5141a45a076f1cb9772a399f7ebcb0948a; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <2733fb2ad5bfbe6538f2f93a21f2504e3dba9d6a; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <62086d1c4602e4f2ec07b975165afc2ed0ff1be9; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <663682cd3192dd4f3547b7890a4391c72441001d; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <9ae47f11493509cde707af8ecc7eee04c8b8e635; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <dbc3a0b917c4f75292b1c0819c188e40fd3c8924; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <e2a28807b1ceaa309164b92c38d73d12feea33df; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <f1f7122bb2ef056afc6f91ce4c35ab6df1207c8d

Published CVSS scores

5.5Canonical UbuntuCVSS: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.

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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

T1499.004Application or System Exploitation

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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