CVE-2026-89983Public exploit

System hang via I2C adapter-removal race

Published Sep 16, 2026 · Updated Sep 16, 2026

A race in the Linux kernel I2C core allows local users to trigger a use-after-free and system hang during adapter removal. i2c_del_adapter leaves new_device writable after freeing adapter debugfs state, so a racing write reaches i2c_device_probe and reuses the freed parent. Reachability requires local write access to the adapter's new_device sysfs attribute while that adapter is being removed; a late client can also prevent teardown completion.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

A race in the Linux kernel I2C core allows local users to trigger a use-after-free and system hang during adapter removal. i2c_del_adapter leaves new_device writable after freeing adapter debugfs state, so a racing write reaches i2c_device_probe and reuses the freed parent. Reachability requires local write access to the adapter's new_device sysfs attribute while that adapter is being removed; a late client can also prevent teardown completion.

The record

CVE
CVE-2026-89983
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=0e8926abfd7aee220e44be5566affd7a8580b50e <dc33a9762538b3250ed6b5644a4d44c748be33a6
  2. Affected versionversion=4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e <f9094ace03e0a532cc6505d2e97b61ae738da4ed
  3. Affected versionversion=5.15.168 <5.15.221
  4. Affected versionversion=6.1.113 <6.1.188
  5. Affected versionversion=6.6.55 <6.6.157
  6. Affected versionversion=6.8
  7. Affected versionversion=73febd775bdbdb98c81255ff85773ac410ded5c4 <112b3d48084c820bbccf41d9783fd122e3ac4cb0
  8. Affected versionversion=73febd775bdbdb98c81255ff85773ac410ded5c4 <552836be2d95c688eede6371f85532abe1a71232
  9. Affected versionversion=73febd775bdbdb98c81255ff85773ac410ded5c4 <643fb872aa04342d27dbef52b2b3cf3fe71b2c7b
  10. Affected versionversion=73febd775bdbdb98c81255ff85773ac410ded5c4 <b15b548d52b43ba8ac4652bc2c7244a8dd1e9622
  11. Affected versionversion=e2a268b0f512fb18ae5961b1fdfaf610ed6bd661 <1f1bcd4eca6caa3e4258d9a31925112539406eb6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0e8926abfd7aee220e44be5566affd7a8580b50e <dc33a9762538b3250ed6b5644a4d44c748be33a6; version=4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e <f9094ace03e0a532cc6505d2e97b61ae738da4ed; version=5.15.168 <5.15.221; version=6.1.113 <6.1.188; version=6.6.55 <6.6.157; version=6.8; version=73febd775bdbdb98c81255ff85773ac410ded5c4 <112b3d48084c820bbccf41d9783fd122e3ac4cb0; version=73febd775bdbdb98c81255ff85773ac410ded5c4 <552836be2d95c688eede6371f85532abe1a71232; version=73febd775bdbdb98c81255ff85773ac410ded5c4 <643fb872aa04342d27dbef52b2b3cf3fe71b2c7b; version=73febd775bdbdb98c81255ff85773ac410ded5c4 <b15b548d52b43ba8ac4652bc2c7244a8dd1e9622; version=e2a268b0f512fb18ae5961b1fdfaf610ed6bd661 <1f1bcd4eca6caa3e4258d9a31925112539406eb6

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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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