CVE-2026-53400

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux6e13e641841833cc2aa5baefe89bb04bc388801b < 78793c75dc6d0ff2e4d50ad617349b328a99054eaffected
LinuxLinux6e13e641841833cc2aa5baefe89bb04bc388801b < 6a946038f2a5a8c29048c6af369d4e391448a5c5affected
LinuxLinux6e13e641841833cc2aa5baefe89bb04bc388801b < a4c8094bbf4c6fa68b17e3b16f6a0a1b7a14f3e0affected
LinuxLinux6e13e641841833cc2aa5baefe89bb04bc388801b < ba14d7cf2fe7284610a29854bdff22b2537d3ce6affected
LinuxLinux2.6.22affected
LinuxLinux0 < 2.6.22unaffected
LinuxLinux6.12.95 <= 6.12.*unaffected
LinuxLinux6.18.38 <= 6.18.*unaffected
LinuxLinux7.1.3 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References