CVE-2026-98347

Interface teardown hang via IPoIB state restoration race

Published Oct 6, 2026 · Updated Oct 6, 2026

A race in the Linux kernel IPoIB driver hangs interface teardown on affected hosts when a multicast flush overlaps device shutdown. The light-flush path restores IPOIB_FLAG_OPER_UP after the down path clears it, leaving a carrier workqueue retrying while teardown waits for that workqueue under RTNL. The condition requires an IPoIB interface and overlapping flush and shutdown paths; the upstream patch does not identify a remotely triggerable input or an attacker privilege level.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race in the Linux kernel IPoIB driver hangs interface teardown on affected hosts when a multicast flush overlaps device shutdown. The light-flush path restores IPOIB_FLAG_OPER_UP after the down path clears it, leaving a carrier workqueue retrying while teardown waits for that workqueue under RTNL. The condition requires an IPoIB interface and overlapping flush and shutdown paths; the upstream patch does not identify a remotely triggerable input or an attacker privilege level.

The record

CVE
CVE-2026-98347
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

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

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=3.10.105 <3.11
  2. Affected versionversion=3.12.65 <3.13
  3. Affected versionversion=3.16.39 <3.17
  4. Affected versionversion=3.2.84 <3.3
  5. Affected versionversion=344bacca8cd811809fc33a249f2738ab757d327f <188b334a6db36a8e0bfaaf59bc4020639a0f3aad
  6. Affected versionversion=344bacca8cd811809fc33a249f2738ab757d327f <1b11e4b55b41d9e69a8e8d07622614202e2eaca9
  7. Affected versionversion=344bacca8cd811809fc33a249f2738ab757d327f <1ff3add37c329704ec46181b4ae4f00f9f16ce6f
  8. Affected versionversion=344bacca8cd811809fc33a249f2738ab757d327f <326f7d34bd7e64de535566b65c0533b640df5a81
  9. Affected versionversion=344bacca8cd811809fc33a249f2738ab757d327f <5ad925d45f28464a5e043c9620880bb6a030da89
  10. Affected versionversion=344bacca8cd811809fc33a249f2738ab757d327f <9a141d3dc869d18b2eab35e999f4790a9b84e40f
  11. Affected versionversion=344bacca8cd811809fc33a249f2738ab757d327f <b72f38929f4b5aa83161fd3b22a7327207e51ec5
  12. Affected versionversion=344bacca8cd811809fc33a249f2738ab757d327f <f973769fb7cb33ba0d4a64b7dcfee0cabaead938
  13. Affected versionversion=4.4.24 <4.5
  14. Affected versionversion=4.7.7 <4.8
  15. Affected versionversion=4.8
  16. Affected versionversion=749fd55dd210f9676f0d445a6efaaa3bec65174a
  17. Affected versionversion=87160fb51bc343793cc8f5f031a87f1a35aecb82
  18. Affected versionversion=8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5
  19. Affected versionversion=a289c65ca49d2680a3d797e633e57a45573d1df2
  20. Affected versionversion=b81459c78935e4579a577b2366c5f8878d3c7fee
  21. Affected versionversion=dfe809702a11bd7fb91c882fb55620e39ce22109

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.10.105 <3.11; version=3.12.65 <3.13; version=3.16.39 <3.17; version=3.2.84 <3.3; version=344bacca8cd811809fc33a249f2738ab757d327f <188b334a6db36a8e0bfaaf59bc4020639a0f3aad; version=344bacca8cd811809fc33a249f2738ab757d327f <1b11e4b55b41d9e69a8e8d07622614202e2eaca9; version=344bacca8cd811809fc33a249f2738ab757d327f <1ff3add37c329704ec46181b4ae4f00f9f16ce6f; version=344bacca8cd811809fc33a249f2738ab757d327f <326f7d34bd7e64de535566b65c0533b640df5a81; version=344bacca8cd811809fc33a249f2738ab757d327f <5ad925d45f28464a5e043c9620880bb6a030da89; version=344bacca8cd811809fc33a249f2738ab757d327f <9a141d3dc869d18b2eab35e999f4790a9b84e40f; version=344bacca8cd811809fc33a249f2738ab757d327f <b72f38929f4b5aa83161fd3b22a7327207e51ec5; version=344bacca8cd811809fc33a249f2738ab757d327f <f973769fb7cb33ba0d4a64b7dcfee0cabaead938; version=4.4.24 <4.5; version=4.7.7 <4.8; version=4.8; version=749fd55dd210f9676f0d445a6efaaa3bec65174a; version=87160fb51bc343793cc8f5f031a87f1a35aecb82; version=8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5; version=a289c65ca49d2680a3d797e633e57a45573d1df2; version=b81459c78935e4579a577b2366c5f8878d3c7fee; version=dfe809702a11bd7fb91c882fb55620e39ce22109

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)
VectorUnavailable
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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