CVE-2026-43036Public exploit

Service interruption via unsafe IPv4 header dereference

Published May 1, 2026 · Updated May 1, 2026

Use of uninitialized memory in Linux Kernel 4.7 and later allows local users to interrupt service through crafted PF_PACKET traffic. gso_features_check() directly dereferences iph->frag_off through ip_hdr() or inner_ip_hdr() when packet data can be non-linear or the header offset unsafe. Exploitation requires low-privileged local access able to inject PF_PACKET frames, and the documented impact is limited to system availability.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of uninitialized memory in Linux Kernel 4.7 and later allows local users to interrupt service through crafted PF_PACKET traffic. gso_features_check() directly dereferences iph->frag_off through ip_hdr() or inner_ip_hdr() when packet data can be non-linear or the header offset unsafe. Exploitation requires low-privileged local access able to inject PF_PACKET frames, and the documented impact is limited to system availability.

The record

CVE
CVE-2026-43036
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=4.7
  2. Affected versionversion=cbc53e08a793b073e79f42ca33f1f3568703540d <cc91202fc20a44aab4c206f12a2bfe05da936051
  3. Affected versionversion=cbc53e08a793b073e79f42ca33f1f3568703540d <d970341cfa5594614c7a6634886c7688b4f5cafd
  4. Affected versionversion=cbc53e08a793b073e79f42ca33f1f3568703540d <ddc748a391dd8642ba6b2e4fe22e7f2ddf84b7f0
  5. Affected versionversion=cbc53e08a793b073e79f42ca33f1f3568703540d <f7a6cd508e9e825a2c69fa9e13d41ee156852f25

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.7; version=cbc53e08a793b073e79f42ca33f1f3568703540d <cc91202fc20a44aab4c206f12a2bfe05da936051; version=cbc53e08a793b073e79f42ca33f1f3568703540d <d970341cfa5594614c7a6634886c7688b4f5cafd; version=cbc53e08a793b073e79f42ca33f1f3568703540d <ddc748a391dd8642ba6b2e4fe22e7f2ddf84b7f0; version=cbc53e08a793b073e79f42ca33f1f3568703540d <f7a6cd508e9e825a2c69fa9e13d41ee156852f25

Published CVSS scores

5.5NIST NVDCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1499.004Application or System Exploitation

Public exploit references

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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