CVE-2026-43341Network attack vector

Kernel memory corruption via IOAM6 length wraparound

Published May 8, 2026 · Updated May 8, 2026

Out-of-bounds write in affected Linux Kernel releases allows remote attackers to corrupt kernel memory through crafted IPv6 IOAM trace data. ioam6_fill_trace_data() stores a 256-unit schema contribution in a u8, wrapping it to zero so __ioam6_fill_trace_data() skips space reservation but copies the header and payload. The vulnerable ingress path requires IOAM6 acceptance to be enabled, which Linux disables by default; a successful overwrite can crash the host or alter kernel memory.

CVSS severity9.8
Critical
EPSS probability0.41%
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 write in affected Linux Kernel releases allows remote attackers to corrupt kernel memory through crafted IPv6 IOAM trace data. ioam6_fill_trace_data() stores a 256-unit schema contribution in a u8, wrapping it to zero so __ioam6_fill_trace_data() skips space reservation but copies the header and payload. The vulnerable ingress path requires IOAM6 acceptance to be enabled, which Linux disables by default; a successful overwrite can crash the host or alter kernel memory.

The record

CVE
CVE-2026-43341
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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=5.15
  2. Affected versionversion=8c6f6fa6772696be0c047a711858084b38763728 <184d2e9db27c0f76226b5cad16fe29510a5d2280
  3. Affected versionversion=8c6f6fa6772696be0c047a711858084b38763728 <5e67ba9bb531e1ec6599a82a065dea9040b9ce50
  4. Affected versionversion=8c6f6fa6772696be0c047a711858084b38763728 <77695a69baca9b99d95fad09fc78c2318736604f
  5. Affected versionversion=8c6f6fa6772696be0c047a711858084b38763728 <d1b041080086e91d3733a5438a8c51ad5d3d8e09
  6. Affected versionversion=8c6f6fa6772696be0c047a711858084b38763728 <d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d
  7. Affected versionversion=8c6f6fa6772696be0c047a711858084b38763728 <e96d48b37708d53cbdc47f6f60b0714fc4a5f596

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.15; version=8c6f6fa6772696be0c047a711858084b38763728 <184d2e9db27c0f76226b5cad16fe29510a5d2280; version=8c6f6fa6772696be0c047a711858084b38763728 <5e67ba9bb531e1ec6599a82a065dea9040b9ce50; version=8c6f6fa6772696be0c047a711858084b38763728 <77695a69baca9b99d95fad09fc78c2318736604f; version=8c6f6fa6772696be0c047a711858084b38763728 <d1b041080086e91d3733a5438a8c51ad5d3d8e09; version=8c6f6fa6772696be0c047a711858084b38763728 <d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d; version=8c6f6fa6772696be0c047a711858084b38763728 <e96d48b37708d53cbdc47f6f60b0714fc4a5f596

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

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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