CVE-2026-98102Hinoki check available

Incorrect IPv6 multicast filtering via RCU list diversion

Published Sep 25, 2026 · Updated Sep 25, 2026

Race condition in Linux IPv6 multicast source filtering allows attackers to cause incorrect packet filtering during source removal. The ip6_mc_del1_src() path rewrites an unlinked node's sf_next pointer before an RCU grace period, diverting concurrent readers from active sources into the tombstone list. The race requires an active source filter to be removed while a lockless lookup runs; affected readers can miss valid sources and examine deleted entries, with no further impact documented.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Race condition in Linux IPv6 multicast source filtering allows attackers to cause incorrect packet filtering during source removal. The ip6_mc_del1_src() path rewrites an unlinked node's sf_next pointer before an RCU grace period, diverting concurrent readers from active sources into the tombstone list. The race requires an active source filter to be removed while a lockless lookup runs; affected readers can miss valid sources and examine deleted entries, with no further impact documented.

The record

CVE
CVE-2026-98102
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4b200e398953c237c86d32bf26d4cb2a96556a6f <4352737297b262e8367675c19a7dc6a9f53c97af
  2. Affected versionversion=4b200e398953c237c86d32bf26d4cb2a96556a6f <5149c60c406595b56fda0c6e9aae7fd287f636aa
  3. Affected versionversion=4b200e398953c237c86d32bf26d4cb2a96556a6f <8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4
  4. Affected versionversion=4b200e398953c237c86d32bf26d4cb2a96556a6f <93b49239840b91313adbd77b8b52993eff2d08c1
  5. Affected versionversion=5.10.261 <5.11
  6. Affected versionversion=5.13
  7. Affected versionversion=86c49119f0353f857cc08030ec9e4ebaab3d5a64

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4b200e398953c237c86d32bf26d4cb2a96556a6f <4352737297b262e8367675c19a7dc6a9f53c97af; version=4b200e398953c237c86d32bf26d4cb2a96556a6f <5149c60c406595b56fda0c6e9aae7fd287f636aa; version=4b200e398953c237c86d32bf26d4cb2a96556a6f <8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4; version=4b200e398953c237c86d32bf26d4cb2a96556a6f <93b49239840b91313adbd77b8b52993eff2d08c1; version=5.10.261 <5.11; version=5.13; version=86c49119f0353f857cc08030ec9e4ebaab3d5a64

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)
Vectorlocal
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

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started