CVE-2024-56720

Kernel memory corruption via SK_MSG pop handling

Published Dec 29, 2024 · Updated Aug 5, 2026

Memory corruption in the Linux kernel allows local users to read or overwrite kernel memory through crafted SK_MSG socket data. In bpf_msg_pop_data, sk_msg_shift_left mishandles scatterlist iteration and page references, while incorrect length arithmetic drives out-of-bounds memcpy operations and stale page pointers. Reachability requires a locally loaded BPF_PROG_TYPE_SK_MSG program attached to a sockmap, CAP_BPF and CAP_NET_ADMIN, and a triggering sendmsg; consequences include kernel-memory disclosure, heap corruption, page leaks, use-after-free, and a kernel panic.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the Linux kernel allows local users to read or overwrite kernel memory through crafted SK_MSG socket data. In bpf_msg_pop_data, sk_msg_shift_left mishandles scatterlist iteration and page references, while incorrect length arithmetic drives out-of-bounds memcpy operations and stale page pointers. Reachability requires a locally loaded BPF_PROG_TYPE_SK_MSG program attached to a sockmap, CAP_BPF and CAP_NET_ADMIN, and a triggering sendmsg; consequences include kernel-memory disclosure, heap corruption, page leaks, use-after-free, and a kernel panic.

The record

CVE
CVE-2024-56720
Published
Dec 29, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-193, CWE-401
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.0
  2. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <275a9f3ef8fabb0cb282a62b9e164dedba7284c5
  3. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <5d609ba262475db450ba69b8e8a557bd768ac07a
  4. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <785180bed9879680d8e5c5e1b54c8ae8d948f4c8
  5. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <98c7ea7d11f2588e8197db042e0291e4ac8f8346
  6. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <d26d977633d1d0b8bf9407278189bd0a8d973323
  7. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <d3f5763b3062514a234114e97bbde74d8d702449
  8. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <e1f54c61c4c9a5244eb8159dce60d248f7d97b32
  9. Affected versionversion=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <f58d3aa457e77a3d9b3df2ab081dcf9950f6029f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.0; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <275a9f3ef8fabb0cb282a62b9e164dedba7284c5; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <5d609ba262475db450ba69b8e8a557bd768ac07a; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <785180bed9879680d8e5c5e1b54c8ae8d948f4c8; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <98c7ea7d11f2588e8197db042e0291e4ac8f8346; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <d26d977633d1d0b8bf9407278189bd0a8d973323; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <d3f5763b3062514a234114e97bbde74d8d702449; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <e1f54c61c4c9a5244eb8159dce60d248f7d97b32; version=7246d8ed4dcce23f7509949a77be15fa9f0e3d28 <f58d3aa457e77a3d9b3df2ab081dcf9950f6029f

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux kernel CNACVSS: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

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-193Off-by-one Error
CWE-401Missing Release of Memory after Effective Lifetime

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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