CVE-2024-56643

Kernel memory exhaustion via leaked DCCP feature values

Published Dec 27, 2024 · Updated May 11, 2026

Memory leak in Linux kernel DCCP feature negotiation allows local users to exhaust kernel memory through failed SP confirmations. In dccp_feat_change_recv, an accepted SP value cloned by dccp_feat_clone_sp_val remains allocated when dccp_feat_push_confirm fails on the unreconciled entry path. Repeated triggering requires local low-privileged access and interrupts service by depleting kernel memory.

CVSS severity5.5
Medium
EPSS probability0.23%
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 DCCP feature negotiation allows local users to exhaust kernel memory through failed SP confirmations. In dccp_feat_change_recv, an accepted SP value cloned by dccp_feat_clone_sp_val remains allocated when dccp_feat_push_confirm fails on the unreconciled entry path. Repeated triggering requires local low-privileged access and interrupts service by depleting kernel memory.

The record

CVE
CVE-2024-56643
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE 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=2.6.29
  2. Affected versionversion=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <22be4727a8f898442066bcac34f8a1ad0bc72e14
  3. Affected versionversion=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <623be080ab3c13d71570bd32f7202a8efa8e2252
  4. Affected versionversion=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <6ff67909ee2ffad911e3122616df41dee23ff4f6
  5. Affected versionversion=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <9ee68b0f23706a77f53c832457b9384178b76421
  6. Affected versionversion=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <bc3d4423def1a9412a0ae454cb4477089ab79276
  7. Affected versionversion=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <c99507fff94b926fc92279c92d80f229c91cb85d
  8. Affected versionversion=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <d3ec686a369fae5034303061f003cd3f94ddfd23

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.29; version=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <22be4727a8f898442066bcac34f8a1ad0bc72e14; version=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <623be080ab3c13d71570bd32f7202a8efa8e2252; version=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <6ff67909ee2ffad911e3122616df41dee23ff4f6; version=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <9ee68b0f23706a77f53c832457b9384178b76421; version=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <bc3d4423def1a9412a0ae454cb4477089ab79276; version=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <c99507fff94b926fc92279c92d80f229c91cb85d; version=e77b8363b2ea7c0d89919547c1a8b0562f298b57 <d3ec686a369fae5034303061f003cd3f94ddfd23

Published CVSS scores

3.3UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
5.5Amazon LinuxCVSS: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-401Missing Release of Memory after Effective Lifetime
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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