CVE-2026-43155: mux: mmio: fix regmap leak on probe failure

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-401

Description

In the Linux kernel, the following vulnerability has been resolved: mux: mmio: fix regmap leak on probe failure The mmio regmap that may be allocated during probe is never freed. Switch to using the device managed allocator so that the regmap is released on probe failures (e.g. probe deferral) and on driver unbind.

Affected products

Linux kernel: from 6.16 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/3c4ae63073d84abee5d81ce46d86a94e9dae9c89
https://git.kernel.org/stable/c/76096f156fe9dc9fbd6e4618088706e91b9b0a6c
https://git.kernel.org/stable/c/cbde3c109d52564ae2c12e514c33c44345e84b2c

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