CVE-2022-49018

Kernel disruption via MPTCP close-path lock misuse

Published Oct 21, 2024 · Updated May 23, 2026

Improper locking in Linux kernel MPTCP 5.19.14 through 6.0.11 allows local users to disrupt kernel availability by closing a socket. The __mptcp_close_ssk path holds the fast socket lock while mptcp_close reaches an operation that can sleep in atomic context. Reachability requires local low-privileged access and an MPTCP socket close sequence; the published record reports no confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux kernel MPTCP 5.19.14 through 6.0.11 allows local users to disrupt kernel availability by closing a socket. The __mptcp_close_ssk path holds the fast socket lock while mptcp_close reaches an operation that can sleep in atomic context. Reachability requires local low-privileged access and an MPTCP socket close sequence; the published record reports no confidentiality or integrity impact.

The record

CVE
CVE-2022-49018
Published
Oct 21, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=30e51b923e436b631e8d5b77fa5e318c6b066dc7 <b4f166651d03b5484fa179817ba8ad4899a5a6ac
  2. Affected versionversion=30e51b923e436b631e8d5b77fa5e318c6b066dc7 <d8e6c5500dbf0f3e87aace90d4beba6ae928e866
  3. Affected versionversion=5.19.14 <5.20
  4. Affected versionversion=6.0
  5. Affected versionversion=b41808bfa049d1bc7ce8ce1ad4d591f7d203ebb9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=30e51b923e436b631e8d5b77fa5e318c6b066dc7 <b4f166651d03b5484fa179817ba8ad4899a5a6ac; version=30e51b923e436b631e8d5b77fa5e318c6b066dc7 <d8e6c5500dbf0f3e87aace90d4beba6ae928e866; version=5.19.14 <5.20; version=6.0; version=b41808bfa049d1bc7ce8ce1ad4d591f7d203ebb9

Published CVSS scores

5.5NIST NVDCVSS: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 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-667Improper Locking
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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