PT-2026-61105 · Linux · Linux

CVE-2026-53400 · Published 2026-07-19 · Updated 2026-07-19

Mitre

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

In the Linux kernel, the following vulnerability has been resolved:

i2c: core: fix adapter registration race

Adapters can be looked up based on their id using i2c get adapter() which takes a reference to the embedded struct device.

Make sure that the adapter (including its struct device) has been initialised before adding it to the IDR to avoid accessing uninitialised data which could, for example, lead to NULL-pointer dereferences or use-after-free.

Note that the i2c-dev chardev, which is registered from a bus notifier, currently uses i2c get adapter() so the adapter needs to be added to the IDR before registration.

Fix

Related Identifiers

CVE-2026-53400

Affected Products

Linux

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-53400 · Security Note
• https://git.kernel.org/stable/c/6a946038f2a5a8c29048c6af369d4e391448a5c5 · Note
• https://git.kernel.org/stable/c/a4c8094bbf4c6fa68b17e3b16f6a0a1b7a14f3e0 · Note
• https://git.kernel.org/stable/c/ba14d7cf2fe7284610a29854bdff22b2537d3ce6 · Note
• https://git.kernel.org/stable/c/78793c75dc6d0ff2e4d50ad617349b328a99054e · Note