CVE-2024-56638

Kernel packet-state corruption via stale per-CPU offsets

Published Dec 27, 2024 · Updated May 11, 2026

Race condition in nft_inner in Linux kernel 6.2 through 6.6.65, 6.7 through 6.12.4, and 6.13-rc1 allows local users to corrupt parsing. A softirq can interrupt process-context packet walking while both use a per-CPU area, restoring offsets for the wrong sk_buff or tunnel without validating its cookie, parse-complete flag, or tunnel type. Low-privileged local access is required; stale offsets corrupt inner-header interpretation, while public sources document no reliable exploit outcome.

CVSS severity7.8
High
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

Race condition in nft_inner in Linux kernel 6.2 through 6.6.65, 6.7 through 6.12.4, and 6.13-rc1 allows local users to corrupt parsing. A softirq can interrupt process-context packet walking while both use a per-CPU area, restoring offsets for the wrong sk_buff or tunnel without validating its cookie, parse-complete flag, or tunnel type. Low-privileged local access is required; stale offsets corrupt inner-header interpretation, while public sources document no reliable exploit outcome.

The record

CVE
CVE-2024-56638
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=3a07327d10a09379315c844c63f27941f5081e0a <53c7314208c865086d78b4e88da53bc33da0b603
  2. Affected versionversion=3a07327d10a09379315c844c63f27941f5081e0a <7b1d83da254be3bf054965c8f3b1ad976f460ae5
  3. Affected versionversion=3a07327d10a09379315c844c63f27941f5081e0a <da5cc778e7bf78fe525bc90ec2043f41415c31d9
  4. Affected versionversion=6.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3a07327d10a09379315c844c63f27941f5081e0a <53c7314208c865086d78b4e88da53bc33da0b603; version=3a07327d10a09379315c844c63f27941f5081e0a <7b1d83da254be3bf054965c8f3b1ad976f460ae5; version=3a07327d10a09379315c844c63f27941f5081e0a <da5cc778e7bf78fe525bc90ec2043f41415c31d9; version=6.2

Published CVSS scores

7.8UbuntuCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

No sourced classifications are available.

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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