Bug 2511936 (CVE-2026-64589)

Summary: CVE-2026-64589 kernel: i2c: core: fix NULL-deref on adapter registration failure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's I2C core component. When an I2C adapter fails to register, a NULL-pointer dereference occurs because the associated completion structure is not properly initialized. This vulnerability can lead to a system crash, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-08-06 07:31:42 UTC 
In the Linux kernel, the following vulnerability has been resolved:

i2c: core: fix NULL-deref on adapter registration failure

If adapter registration ever fails the release callback would trigger a
NULL-pointer dereference as the completion struct has not been
initialised.

Note that before the offending commit this would instead have resulted
in a minor memory leak of the adapter name.
Comment 1 gkamathe 2026-08-07 07:01:04 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026080650-CVE-2026-64589-be26@gregkh/T