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CVE-2026-46228: spi: ch341: fix devres lifetime

• 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: 2026-05-28 · updated 2026-10-21
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: spi: ch341: fix devres lifetime USB drivers bind to USB interfaces and any device managed resources should have their lifetime tied to the interface rather than parent USB device. This avoids issues like memory leaks when drivers are unbound without their devices being physically disconnected (e.g. on probe deferral or configuration changes). Fix the controller and driver data lifetime so that they are released on driver unbind. Note that this also makes sure that the SPI controller is placed correctly under the USB interface in the device tree.

Affected products

• Linux kernel: from 6.11 before 6.18.32; from 6.19 before 7.0.9 — fixed in 6.18.32, 7.0.9

How to fix

Upgrade to a fixed version: Linux kernel 6.18.32, 7.0.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/108a64b27a52f781c4f3751641e3dd65c7dd2fb5
• https://git.kernel.org/stable/c/42dfcd2ced905ea3993d88a051c13e04ab1029f7
• https://git.kernel.org/stable/c/4422fc2411cbbdf5104a914e0596bb483faea254
• https://git.kernel.org/stable/c/abe572f630bc1f0e77041012ab075869036ede4f

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