CVE-2022-49814Public exploit

Kernel compromise via KCM receive-queue race

Published May 1, 2025 · Updated Aug 5, 2026

Race condition in the Linux kernel KCM receive path allows local users to read or write kernel memory or crash the host through concurrent calls. kcm_recvmsg() receives from sk_receive_queue without the locking used by requeue_rx_msgs(), allowing one thread to retain an skb after another dequeues or frees it. An unprivileged local account can create KCM sockets and drive both sides of the race without user interaction; remote TCP traffic alone cannot reach the racing window.

CVSS severity4.7
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

Race condition in the Linux kernel KCM receive path allows local users to read or write kernel memory or crash the host through concurrent calls. kcm_recvmsg() receives from sk_receive_queue without the locking used by requeue_rx_msgs(), allowing one thread to retain an skb after another dequeues or frees it. An unprivileged local account can create KCM sockets and drive both sides of the race without user interaction; remote TCP traffic alone cannot reach the racing window.

The record

CVE
CVE-2022-49814
Published
May 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499.004, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record 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 <22f6b5d47396b4287662668ee3f5c1f766cb4259
  3. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <4154b6afa2bd639214ff259d912faad984f7413a
  4. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <5121197ecc5db58c07da95eb1ff82b98b121a221
  5. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <bf92e54597d842da127c59833b365d6faeeaf020
  6. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <ce57d6474ae999a3b2d442314087473a646a65c7
  7. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <d9ad4de92e184b19bcae4da10dac0275abf83931
  8. Affected versionversion=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.6; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <22f6b5d47396b4287662668ee3f5c1f766cb4259; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <4154b6afa2bd639214ff259d912faad984f7413a; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <5121197ecc5db58c07da95eb1ff82b98b121a221; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <bf92e54597d842da127c59833b365d6faeeaf020; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <ce57d6474ae999a3b2d442314087473a646a65c7; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <d9ad4de92e184b19bcae4da10dac0275abf83931; version=ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 <f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/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 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 exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Application or System Exploitation
T1068Exploitation for Privilege Escalation

Public exploit references

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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