CVE-2022-49204

Service interruption via double-uncharge in sockmap redirection

Published Feb 26, 2025 · Updated May 11, 2026

A local denial-of-service flaw in affected Linux kernels allows local users to trigger kernel warnings and service interruption. When tcp_bpf_sendmsg_redir leaves more data, tcp_bpf_send_verdict calls sk_msg_return, loops, and subtracts the remaining msg->sg.size from sk_forward_alloc a second time. Low-privileged local access and use of the BPF sockmap send-redirection path are required; triggering can destabilize socket teardown.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A local denial-of-service flaw in affected Linux kernels allows local users to trigger kernel warnings and service interruption. When tcp_bpf_sendmsg_redir leaves more data, tcp_bpf_send_verdict calls sk_msg_return, loops, and subtracts the remaining msg->sg.size from sk_forward_alloc a second time. Low-privileged local access and use of the BPF sockmap send-redirection path are required; triggering can destabilize socket teardown.

The record

CVE
CVE-2022-49204
Published
Feb 26, 2025
Updated
May 11, 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 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=4.20
  2. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <168ff181f5b6e7fce684c98a30d35da1dbf8f82a
  3. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <244ce90c8d0bd10ebf957da02c6f3fcd5d920bdf
  4. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <7b812a369e6416ab06d83cdd39d8e3f752781dd0
  5. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <84472b436e760ba439e1969a9e3c5ae7c86de39d
  6. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <87d532d41ef937e16f61b3d2094f3a2ac49be365
  7. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <abb4caa477a5450817d2aa1198edce66450aecf8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=604326b41a6fb9b4a78b6179335decee0365cd8c <168ff181f5b6e7fce684c98a30d35da1dbf8f82a; version=604326b41a6fb9b4a78b6179335decee0365cd8c <244ce90c8d0bd10ebf957da02c6f3fcd5d920bdf; version=604326b41a6fb9b4a78b6179335decee0365cd8c <7b812a369e6416ab06d83cdd39d8e3f752781dd0; version=604326b41a6fb9b4a78b6179335decee0365cd8c <84472b436e760ba439e1969a9e3c5ae7c86de39d; version=604326b41a6fb9b4a78b6179335decee0365cd8c <87d532d41ef937e16f61b3d2094f3a2ac49be365; version=604326b41a6fb9b4a78b6179335decee0365cd8c <abb4caa477a5450817d2aa1198edce66450aecf8

Published CVSS scores

5.5CanonicalCVSS: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.

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Technologies

Your stack

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Your stack

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