CVE-2024-26589

Kernel crash via unchecked flow-key pointer offset

Published Feb 22, 2024 · Updated Aug 5, 2026

Out-of-bounds access in the Linux kernel eBPF verifier allows local users to crash the kernel through a crafted flow-dissector program. check_flow_keys_access() validates only a fixed offset but permits variable-offset arithmetic on PTR_TO_FLOW_KEYS, allowing the pointer to move beyond the flow_keys object. Local access and permission to load the affected BPF program are required; the demonstrated consequence is a kernel page fault and service crash.

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

Out-of-bounds access in the Linux kernel eBPF verifier allows local users to crash the kernel through a crafted flow-dissector program. check_flow_keys_access() validates only a fixed offset but permits variable-offset arithmetic on PTR_TO_FLOW_KEYS, allowing the pointer to move beyond the flow_keys object. Local access and permission to load the affected BPF program are required; the demonstrated consequence is a kernel page fault and service crash.

The record

CVE
CVE-2024-26589
Published
Feb 22, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-119, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 22, 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=4.20
  2. Affected versionversion=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <1b500d5d6cecf98dd6ca88bc9e7ae1783c83e6d3
  3. Affected versionversion=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <22c7fa171a02d310e3a3f6ed46a698ca8a0060ed
  4. Affected versionversion=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <29ffa63f21bcdcef3e36b03cccf9d0cd031f6ab0
  5. Affected versionversion=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <4108b86e324da42f7ed425bd71632fd844300dc8
  6. Affected versionversion=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <e8d3872b617c21100c5ee4f64e513997a68c2e3d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <1b500d5d6cecf98dd6ca88bc9e7ae1783c83e6d3; version=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <22c7fa171a02d310e3a3f6ed46a698ca8a0060ed; version=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <29ffa63f21bcdcef3e36b03cccf9d0cd031f6ab0; version=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <4108b86e324da42f7ed425bd71632fd844300dc8; version=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <e8d3872b617c21100c5ee4f64e513997a68c2e3d

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

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

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

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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