CVE-2022-49420

Service interruption via lockless socket interface read

Published Feb 26, 2025 · Updated May 23, 2026

Data race in the Linux kernel before 5.18.3 allows local users to interrupt service through concurrent IPv6 socket operations. udpv6_sendmsg reads sk->sk_bound_dev_if without locking while __ip6_datagram_connect can write the same field from another thread, producing an inconsistent read detected by KCSAN. Exploitation requires local low-privileged access and a successfully timed race between connect and UDP send operations; the kernel maintainer characterized the consequences as minor.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data race in the Linux kernel before 5.18.3 allows local users to interrupt service through concurrent IPv6 socket operations. udpv6_sendmsg reads sk->sk_bound_dev_if without locking while __ip6_datagram_connect can write the same field from another thread, producing an inconsistent read detected by KCSAN. Exploitation requires local low-privileged access and a successfully timed race between connect and UDP send operations; the kernel maintainer characterized the consequences as minor.

The record

CVE
CVE-2022-49420
Published
Feb 26, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE 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=0 <5.18.3
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <20b2f61797873a2b18b5ff1a304ad2674fa1e0a5
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4c971d2f3548e4f11b1460ac048f5307e4b39fdb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0 <5.18.3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <20b2f61797873a2b18b5ff1a304ad2674fa1e0a5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4c971d2f3548e4f11b1460ac048f5307e4b39fdb

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

T1499Endpoint Denial of Service

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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