CVE-2022-49205

Kernel memory-accounting corruption via double uncharge

Published Feb 26, 2025 · Updated May 11, 2026

Double free in the Linux kernel sockmap code allows local users to corrupt socket memory accounting during concurrent socket teardown. tcp_bpf_send_verdict returns sk_msg memory before tcp_bpf_sendmsg_redir calls sk_msg_free again when the associated psock has been freed. Reachability requires local low-privileged access and a tcp_bpf_sendmsg race with teardown; the documented consequence is a kernel warning and inconsistent socket accounting.

CVSS severity7.8
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in the Linux kernel sockmap code allows local users to corrupt socket memory accounting during concurrent socket teardown. tcp_bpf_send_verdict returns sk_msg memory before tcp_bpf_sendmsg_redir calls sk_msg_free again when the associated psock has been freed. Reachability requires local low-privileged access and a tcp_bpf_sendmsg race with teardown; the documented consequence is a kernel warning and inconsistent socket accounting.

The record

CVE
CVE-2022-49205
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415
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 <223f3c51ab163852dd4819d357dcf33039929434
  3. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <2486ab434b2c2a14e9237296db00b1e1b7ae3273
  4. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <94c6ac22abcdede72bfaa0f4c22fb370891f4002
  5. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <ac3ecb7760c750c8e4fc09c719241d8e6e88028c
  6. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <cb6f141ae705af0101e819065a79e6d029f6e393
  7. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <cd84ea3920aef936c559b63099ef0013ce6b2325

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=604326b41a6fb9b4a78b6179335decee0365cd8c <223f3c51ab163852dd4819d357dcf33039929434; version=604326b41a6fb9b4a78b6179335decee0365cd8c <2486ab434b2c2a14e9237296db00b1e1b7ae3273; version=604326b41a6fb9b4a78b6179335decee0365cd8c <94c6ac22abcdede72bfaa0f4c22fb370891f4002; version=604326b41a6fb9b4a78b6179335decee0365cd8c <ac3ecb7760c750c8e4fc09c719241d8e6e88028c; version=604326b41a6fb9b4a78b6179335decee0365cd8c <cb6f141ae705af0101e819065a79e6d029f6e393; version=604326b41a6fb9b4a78b6179335decee0365cd8c <cd84ea3920aef936c559b63099ef0013ce6b2325

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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

CWE-415Double Free

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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