CVE-2026-98241Network attack vector

Out-of-bounds read via request socket miscast

Published Oct 6, 2026 · Updated Oct 6, 2026

An out-of-bounds read in Linux kernel IPv6 XFRM error handling allows remote attackers to trigger invalid reads during TCP SYN-ACK processing. The xfrm6_local_rxpmtu() and xfrm6_local_error() callbacks treat an attached request socket as a full IPv6 socket and read beyond its allocation. Reachability requires a SYN-ACK to take a rerouted IPv6 XFRM tunnel path with a lower MTU; the published patch does not establish data disclosure or a reliable crash.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in Linux kernel IPv6 XFRM error handling allows remote attackers to trigger invalid reads during TCP SYN-ACK processing. The xfrm6_local_rxpmtu() and xfrm6_local_error() callbacks treat an attached request socket as a full IPv6 socket and read beyond its allocation. Reachability requires a SYN-ACK to take a rerouted IPv6 XFRM tunnel path with a lower MTU; the published patch does not establish data disclosure or a reliable crash.

The record

CVE
CVE-2026-98241
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=3.2
  2. Affected versionversion=dd767856a36e00b631d65ebc4bb81b19915532d6 <4c030a0400ebfd2318361c923a88103b2c67c49f
  3. Affected versionversion=dd767856a36e00b631d65ebc4bb81b19915532d6 <60459c670329d586a58db5d8f811fa5accfe4862
  4. Affected versionversion=dd767856a36e00b631d65ebc4bb81b19915532d6 <675919e08ce266b8cac11fd9af29170e762a480f
  5. Affected versionversion=dd767856a36e00b631d65ebc4bb81b19915532d6 <6973a21ee73c5567f883813c8ef414774b45892f
  6. Affected versionversion=dd767856a36e00b631d65ebc4bb81b19915532d6 <904a0e827d0d7189271a3a2eb648293809f25efc
  7. Affected versionversion=dd767856a36e00b631d65ebc4bb81b19915532d6 <b1a88633c36d2cbc3831382f3846754d344276fd
  8. Affected versionversion=dd767856a36e00b631d65ebc4bb81b19915532d6 <c21f3f7fbfeda7c5794f606cb0ffcc2d9001eef8
  9. Affected versionversion=dd767856a36e00b631d65ebc4bb81b19915532d6 <ca3d68c3213475b53db6647e159dc73bd1af5ab1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.2; version=dd767856a36e00b631d65ebc4bb81b19915532d6 <4c030a0400ebfd2318361c923a88103b2c67c49f; version=dd767856a36e00b631d65ebc4bb81b19915532d6 <60459c670329d586a58db5d8f811fa5accfe4862; version=dd767856a36e00b631d65ebc4bb81b19915532d6 <675919e08ce266b8cac11fd9af29170e762a480f; version=dd767856a36e00b631d65ebc4bb81b19915532d6 <6973a21ee73c5567f883813c8ef414774b45892f; version=dd767856a36e00b631d65ebc4bb81b19915532d6 <904a0e827d0d7189271a3a2eb648293809f25efc; version=dd767856a36e00b631d65ebc4bb81b19915532d6 <b1a88633c36d2cbc3831382f3846754d344276fd; version=dd767856a36e00b631d65ebc4bb81b19915532d6 <c21f3f7fbfeda7c5794f606cb0ffcc2d9001eef8; version=dd767856a36e00b631d65ebc4bb81b19915532d6 <ca3d68c3213475b53db6647e159dc73bd1af5ab1

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
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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