CVE-2026-89982: i2c: mux: Fix channel node leak on adapter add failure

Severity: unknown
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-16 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: i2c: mux: Fix channel node leak on adapter add failure i2c_mux_add_adapter() takes a reference to the Device Tree channel node before registering the new adapter. If adapter registration fails, the error path frees the private data without dropping that reference. Release the channel node before freeing the private data.

Affected products

Linux kernel: 3.5 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/0927153f2abf48b6cc3e5f27063a17f7a8d47f38
https://git.kernel.org/stable/c/2b3b06cb709c4bf75a3fe3da3a0ca368ee3b40e5
https://git.kernel.org/stable/c/385c7af4e3b95d0769fd211831674e83b16a2ebf
https://git.kernel.org/stable/c/4c9bc46a2a4afb7a11c48d33bdf19febab431015
https://git.kernel.org/stable/c/4f42f70afd2447f3c82ca69d1e03466a75348ba9
https://git.kernel.org/stable/c/694e7e6edf249723ca7d3ef77c2ca1badfc78dc4
https://git.kernel.org/stable/c/b580f062b24c4eef562f08f210c028adb34ef14e
https://git.kernel.org/stable/c/dd2c1e6747b17b24ecddd48a7bb6bb964c2793d1

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