CVE-2022-49209

Local denial of service via sockmap memory leak

Published Feb 26, 2025 · Updated May 11, 2026

Memory leak in Linux kernel 4.20 through 5.17.1 allows local users to exhaust memory by filling a BPF sockmap send buffer. When sk_msg_alloc() partially grows the scatter-gather list and returns -ENOMEM, it enters the wait-for-memory path without trimming the newly allocated memory. A low-privileged local user who can drive repeated BPF sockmap send attempts under memory pressure can cause availability loss and kernel warnings.

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

Memory leak in Linux kernel 4.20 through 5.17.1 allows local users to exhaust memory by filling a BPF sockmap send buffer. When sk_msg_alloc() partially grows the scatter-gather list and returns -ENOMEM, it enters the wait-for-memory path without trimming the newly allocated memory. A low-privileged local user who can drive repeated BPF sockmap send attempts under memory pressure can cause availability loss and kernel warnings.

The record

CVE
CVE-2022-49209
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.004
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 <6d03722c34d9603df325f67c6d30dc1b7b3c6067
  3. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <9c34e38c4a870eb30b13f42f5b44f42e9d19ccb8
  4. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <bec34a91eba3483e1830c02bdd36f8f968642047
  5. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <d0b85dfc6f01d26808e2576c6537c131b590e270
  6. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <de3a8d8fab0710186f7864ec812836d8d70da3c9
  7. Affected versionversion=604326b41a6fb9b4a78b6179335decee0365cd8c <f677328f05f52d535cbdc15cb04476db49477eb4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=604326b41a6fb9b4a78b6179335decee0365cd8c <6d03722c34d9603df325f67c6d30dc1b7b3c6067; version=604326b41a6fb9b4a78b6179335decee0365cd8c <9c34e38c4a870eb30b13f42f5b44f42e9d19ccb8; version=604326b41a6fb9b4a78b6179335decee0365cd8c <bec34a91eba3483e1830c02bdd36f8f968642047; version=604326b41a6fb9b4a78b6179335decee0365cd8c <d0b85dfc6f01d26808e2576c6537c131b590e270; version=604326b41a6fb9b4a78b6179335decee0365cd8c <de3a8d8fab0710186f7864ec812836d8d70da3c9; version=604326b41a6fb9b4a78b6179335decee0365cd8c <f677328f05f52d535cbdc15cb04476db49477eb4

Published CVSS scores

5.5CISA-ADPCVSS: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 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-401Missing Release of Memory after Effective Lifetime
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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