CVE-2026-93108Hinoki check available

Service interruption via premature RCU callback code unloading

Published Sep 17, 2026 · Updated Sep 17, 2026

Use-after-unload in Linux IPoIB allows local users to interrupt kernel operation via a race during module teardown. ipoib_cleanup_module() and the ipoib_init_module() failure path omit RCU callback draining, allowing ib_ipoib code to continue executing after unload. Exposure requires IPoIB callbacks during teardown or failed client registration; published sources do not specify whether interruption is a crash or hang.

CVSS severity4.1
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-unload in Linux IPoIB allows local users to interrupt kernel operation via a race during module teardown. ipoib_cleanup_module() and the ipoib_init_module() failure path omit RCU callback draining, allowing ib_ipoib code to continue executing after unload. Exposure requires IPoIB callbacks during teardown or failed client registration; published sources do not specify whether interruption is a crash or hang.

The record

CVE
CVE-2026-93108
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=3.6
  2. Affected versionversion=b63b70d8774175b6f8393c495fe455f0fba55ce1 <24ce944721dcd92ae62e7a448d770e2a3e79f5fd
  3. Affected versionversion=b63b70d8774175b6f8393c495fe455f0fba55ce1 <2b3330cfc097db2d31f47ad09261967630270d66
  4. Affected versionversion=b63b70d8774175b6f8393c495fe455f0fba55ce1 <31b7c700670830a0e8a4cdcd451c88a13cc5dc48
  5. Affected versionversion=b63b70d8774175b6f8393c495fe455f0fba55ce1 <4a6dc313f9661f80e4ed43461d7ed5615c2450ca
  6. Affected versionversion=b63b70d8774175b6f8393c495fe455f0fba55ce1 <7bc08d7f9338c9f9c09965e5d020591c793a80cb
  7. Affected versionversion=b63b70d8774175b6f8393c495fe455f0fba55ce1 <8dc5ffcb8efcc01e44dd1ebc490eaae72de3fadf
  8. Affected versionversion=b63b70d8774175b6f8393c495fe455f0fba55ce1 <bb9c23733a0c50e136bd40c27cb60023cc58e22c
  9. Affected versionversion=b63b70d8774175b6f8393c495fe455f0fba55ce1 <d8917353966d1d5a486437dd0dd68a2cf8ecb136

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3.6; version=b63b70d8774175b6f8393c495fe455f0fba55ce1 <24ce944721dcd92ae62e7a448d770e2a3e79f5fd; version=b63b70d8774175b6f8393c495fe455f0fba55ce1 <2b3330cfc097db2d31f47ad09261967630270d66; version=b63b70d8774175b6f8393c495fe455f0fba55ce1 <31b7c700670830a0e8a4cdcd451c88a13cc5dc48; version=b63b70d8774175b6f8393c495fe455f0fba55ce1 <4a6dc313f9661f80e4ed43461d7ed5615c2450ca; version=b63b70d8774175b6f8393c495fe455f0fba55ce1 <7bc08d7f9338c9f9c09965e5d020591c793a80cb; version=b63b70d8774175b6f8393c495fe455f0fba55ce1 <8dc5ffcb8efcc01e44dd1ebc490eaae72de3fadf; version=b63b70d8774175b6f8393c495fe455f0fba55ce1 <bb9c23733a0c50e136bd40c27cb60023cc58e22c; version=b63b70d8774175b6f8393c495fe455f0fba55ce1 <d8917353966d1d5a486437dd0dd68a2cf8ecb136

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
7.8TenableCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2TenableAV:L/AC:L/Au:N/C:C/I:C/A:C

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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Your stack

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