CVE-2024-26804

Kernel memory disclosure and corruption via tunnel recursion

Published Apr 4, 2024 · Updated Aug 12, 2026

Use-after-free in the Linux kernel allows local users to read and corrupt kernel memory through recursive GRE and IPIP tunnels. Recursive ip_tunnel_xmit calls continually increase needed_headroom until the 16-bit network_header wraps and a negative offset is passed to an unsigned pull operation, moving skb->data outside its allocation. Reaching the flaw requires creation of a GRE-to-IPIP routing cycle in a private network namespace; the resulting primitive can disclose kernel memory and corrupt adjacent kernel objects.

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

Use-after-free in the Linux kernel allows local users to read and corrupt kernel memory through recursive GRE and IPIP tunnels. Recursive ip_tunnel_xmit calls continually increase needed_headroom until the 16-bit network_header wraps and a negative offset is passed to an unsigned pull operation, moving skb->data outside its allocation. Reaching the flaw requires creation of a GRE-to-IPIP routing cycle in a private network namespace; the resulting primitive can disclose kernel memory and corrupt adjacent kernel objects.

The record

CVE
CVE-2024-26804
Published
Apr 4, 2024
Updated
Aug 12, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=03017375b0122453e6dda833ff7bd4191915def5
  2. Affected versionversion=243aad830e8a4cdda261626fbaeddde16b08d04a <049d7989c67e8dd50f07a2096dbafdb41331fb9b
  3. Affected versionversion=243aad830e8a4cdda261626fbaeddde16b08d04a <2e95350fe9db9d53c701075060ac8ac883b68aee
  4. Affected versionversion=243aad830e8a4cdda261626fbaeddde16b08d04a <5ae1e9922bbdbaeb9cfbe91085ab75927488ac0f
  5. Affected versionversion=243aad830e8a4cdda261626fbaeddde16b08d04a <a0a1db40b23e8ff86dea2786c5ea1470bb23ecb9
  6. Affected versionversion=243aad830e8a4cdda261626fbaeddde16b08d04a <ab63de24ebea36fe73ac7121738595d704b66d96
  7. Affected versionversion=243aad830e8a4cdda261626fbaeddde16b08d04a <afec0c5cd2ed71ca95a8b36a5e6d03333bf34282
  8. Affected versionversion=243aad830e8a4cdda261626fbaeddde16b08d04a <f81e94d2dcd2397137edcb8b85f4c5bed5d22383
  9. Affected versionversion=2.6.33.2 <2.6.34
  10. Affected versionversion=2.6.34

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=03017375b0122453e6dda833ff7bd4191915def5; version=243aad830e8a4cdda261626fbaeddde16b08d04a <049d7989c67e8dd50f07a2096dbafdb41331fb9b; version=243aad830e8a4cdda261626fbaeddde16b08d04a <2e95350fe9db9d53c701075060ac8ac883b68aee; version=243aad830e8a4cdda261626fbaeddde16b08d04a <5ae1e9922bbdbaeb9cfbe91085ab75927488ac0f; version=243aad830e8a4cdda261626fbaeddde16b08d04a <a0a1db40b23e8ff86dea2786c5ea1470bb23ecb9; version=243aad830e8a4cdda261626fbaeddde16b08d04a <ab63de24ebea36fe73ac7121738595d704b66d96; version=243aad830e8a4cdda261626fbaeddde16b08d04a <afec0c5cd2ed71ca95a8b36a5e6d03333bf34282; version=243aad830e8a4cdda261626fbaeddde16b08d04a <f81e94d2dcd2397137edcb8b85f4c5bed5d22383; version=2.6.33.2 <2.6.34; version=2.6.34

Published CVSS scores

7.8Linux kernel CVE teamCVSS: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 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-416Use After Free
T1068Exploitation for Privilege Escalation

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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