CVE-2026-98417Network attack vector

Kernel warnings via truncated transport-header offsets

Published Oct 14, 2026 · Updated Oct 14, 2026

Transport-offset truncation in Linux Kernel ESP-in-TCP allows attackers to trigger kernel warnings via received ESP-in-TCP packets. In net/xfrm/espintcp.c, handle_esp() resets the transport header without checking whether its offset remains representable after the stream parser removes the TCP envelope. The path requires ESP-in-TCP processing; the published evidence establishes a warning, not a crash or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.22%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Transport-offset truncation in Linux Kernel ESP-in-TCP allows attackers to trigger kernel warnings via received ESP-in-TCP packets. In net/xfrm/espintcp.c, handle_esp() resets the transport header without checking whether its offset remains representable after the stream parser removes the TCP envelope. The path requires ESP-in-TCP processing; the published evidence establishes a warning, not a crash or code execution.

The record

CVE
CVE-2026-98417
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
Linux Foundation
Product
Linux Kernel
Classifications
Unavailable
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 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=5.6
  2. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <206f396f46149dc8bc4dfd2b54b9879ba3ee1d7d
  3. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <327b2a457dd7d5445f7395f371f3c65de79bd5ce
  4. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <4a8243fd2e21980fa3fd10c0610e9155057cebd3
  5. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <6c29681207bc213188afa603dff2d55e7178a341
  6. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <96f01b53c2d05e003b040892256de54a586e8529
  7. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <b2b84e73e0386ad0b4f9b8d3afde343e761f5275
  8. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <cce630c751279e974fa0bb574d80575e0cc7e8f3
  9. Affected versionversion=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <d37a5b87577c4b4c1a1dcb000a9dff1df2cf886b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Linux Foundation · Linux Kernelversion=5.6; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <206f396f46149dc8bc4dfd2b54b9879ba3ee1d7d; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <327b2a457dd7d5445f7395f371f3c65de79bd5ce; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <4a8243fd2e21980fa3fd10c0610e9155057cebd3; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <6c29681207bc213188afa603dff2d55e7178a341; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <96f01b53c2d05e003b040892256de54a586e8529; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <b2b84e73e0386ad0b4f9b8d3afde343e761f5275; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <cce630c751279e974fa0bb574d80575e0cc7e8f3; version=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <d37a5b87577c4b4c1a1dcb000a9dff1df2cf886b

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.

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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
PrivilegesUnavailable
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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