CVE-2026-43160: mfd: macsmc: Initialize mutex

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-06 · updated 2026-06-17
Weakness: CWE-908

Description

In the Linux kernel, the following vulnerability has been resolved: mfd: macsmc: Initialize mutex Initialize struct apple_smc's mutex in apple_smc_probe(). Using the mutex uninitialized surprisingly resulted only in occasional NULL pointer dereferences in apple_smc_read() calls from the probe() functions of sub devices.

Affected products

Linux kernel: from 6.17 before 6.18.16; from 6.19 before 6.19.6 — fixed in 6.18.16, 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 6.18.16, 6.19.6. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/2d5932588f029f7787f52c29174fead9bbc6b2cf
https://git.kernel.org/stable/c/414f65d6736342c77d4ec5e7373039f4a09250dd
https://git.kernel.org/stable/c/a1e9e299c0d9ea42ab1067b39fb72e976d3f1bdb

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