SB2026072136 - Race condition in Linux kernel i2c driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-53400)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in the i2c adapter registration logic when looking up adapters by id during registration. A local user can trigger concurrent adapter lookup and registration activity to cause a denial of service.

The issue can lead to access to uninitialized adapter data, including NULL-pointer dereferences or use-after-free.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/6a946038f2a5a8c29048c6af369d4e391448a5c5
• https://git.kernel.org/stable/c/78793c75dc6d0ff2e4d50ad617349b328a99054e
• https://git.kernel.org/stable/c/a4c8094bbf4c6fa68b17e3b16f6a0a1b7a14f3e0
• https://git.kernel.org/stable/c/ba14d7cf2fe7284610a29854bdff22b2537d3ce6