CVE-2026-98531Hinoki check available

Kernel-memory disclosure via short SEG6_ATTR_DST attributes

Published Oct 18, 2026 · Updated Oct 18, 2026

Out-of-bounds reading in Linux IPv6 segment routing allows local users to read kernel heap memory via malformed Netlink attributes. The seg6_genl_policy accepts short SEG6_ATTR_DST payloads, but seg6_genl_set_tunsrc() copies 16 bytes regardless of their length and exposes uninitialized bytes through SEG6_CMD_GET_TUNSRC. Access requires CAP_NET_ADMIN through administrative Generic Netlink commands; the demonstrated consequence is disclosure of 16 bytes of kernel heap memory.

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

What happened

Out-of-bounds reading in Linux IPv6 segment routing allows local users to read kernel heap memory via malformed Netlink attributes. The seg6_genl_policy accepts short SEG6_ATTR_DST payloads, but seg6_genl_set_tunsrc() copies 16 bytes regardless of their length and exposes uninitialized bytes through SEG6_CMD_GET_TUNSRC. Access requires CAP_NET_ADMIN through administrative Generic Netlink commands; the demonstrated consequence is disclosure of 16 bytes of kernel heap memory.

The record

CVE
CVE-2026-98531
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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=4.10
  2. Affected versionversion=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <050a0aa3c80907b8c60a396b7e04d48d8b1a9e70
  3. Affected versionversion=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <195813bb7324c338eaba0aaa02b18681ee65b670
  4. Affected versionversion=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <209eefebee54c4a5f01d68b61e8ac9881eca2de9
  5. Affected versionversion=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <2d959c75c27f90e9ec489d18ce5ee6b852ad4741
  6. Affected versionversion=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <66bf65fa109326e4c4ddeb0b94093379f72838fd
  7. Affected versionversion=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <6fcfc362344edea745a69f3a705de50b731f3418
  8. Affected versionversion=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <94214cf0a08dd2c5f37aeeea46078d9dfe8e4a0e
  9. Affected versionversion=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <e3ac68c1cdc2535d127b2bfd50c263d16c8e4199

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.10; version=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <050a0aa3c80907b8c60a396b7e04d48d8b1a9e70; version=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <195813bb7324c338eaba0aaa02b18681ee65b670; version=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <209eefebee54c4a5f01d68b61e8ac9881eca2de9; version=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <2d959c75c27f90e9ec489d18ce5ee6b852ad4741; version=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <66bf65fa109326e4c4ddeb0b94093379f72838fd; version=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <6fcfc362344edea745a69f3a705de50b731f3418; version=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <94214cf0a08dd2c5f37aeeea46078d9dfe8e4a0e; version=915d7e5e5930b4f01d0971d93b9b25ed17d221aa <e3ac68c1cdc2535d127b2bfd50c263d16c8e4199

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)
Vectorlocal
Privilegesadmin
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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