CVE-2026-64589

Service interruption via uninitialized completion dereference

Published Aug 6, 2026 · Updated Aug 6, 2026

NULL-pointer dereference in the Linux kernel I2C core allows local users to interrupt affected systems during failed adapter registration. In drivers/i2c/i2c-core-base.c, the adapter release callback dereferences a completion structure that registration did not initialize. Reaching the fault requires a local, high-privileged path that causes adapter registration to fail; no confidentiality or integrity impact is reported.

CVSS severity4.1
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL-pointer dereference in the Linux kernel I2C core allows local users to interrupt affected systems during failed adapter registration. In drivers/i2c/i2c-core-base.c, the adapter release callback dereferences a completion structure that registration did not initialize. Reaching the fault requires a local, high-privileged path that causes adapter registration to fail; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2026-64589
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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=3f8c4f5e9a57868fa107016c81165686d23325f2 <034e307428119b67f5f18a35e4f4e7d15a2b9774
  2. Affected versionversion=3f8c4f5e9a57868fa107016c81165686d23325f2 <2295d2bb101faa663fbc45fadbb3fec45f107441
  3. Affected versionversion=3f8c4f5e9a57868fa107016c81165686d23325f2 <3351c5e77749a0c8a1e252b95420c143ebcf07ac
  4. Affected versionversion=6.12.11 <6.12.96
  5. Affected versionversion=6.13
  6. Affected versionversion=e19f31169f85c712c9fca35bfd28ceb093a9f574 <2ce0a74bfa3acdfcdb00cf02f181f2754b451f42

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3f8c4f5e9a57868fa107016c81165686d23325f2 <034e307428119b67f5f18a35e4f4e7d15a2b9774; version=3f8c4f5e9a57868fa107016c81165686d23325f2 <2295d2bb101faa663fbc45fadbb3fec45f107441; version=3f8c4f5e9a57868fa107016c81165686d23325f2 <3351c5e77749a0c8a1e252b95420c143ebcf07ac; version=6.12.11 <6.12.96; version=6.13; version=e19f31169f85c712c9fca35bfd28ceb093a9f574 <2ce0a74bfa3acdfcdb00cf02f181f2754b451f42

Published CVSS scores

4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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