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CVE-2026-31759: usb: ulpi: fix double free in ulpi_register_interface() error path

• Severity: high (CVSS 7.8 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: 2026-05-01 · updated 2026-06-17
• Weakness: CWE-415

Description

In the Linux kernel, the following vulnerability has been resolved: usb: ulpi: fix double free in ulpi_register_interface() error path When device_register() fails, ulpi_register() calls put_device() on ulpi->dev. The device release callback ulpi_dev_release() drops the OF node reference and frees ulpi, but the current error path in ulpi_register_interface() then calls kfree(ulpi) again, causing a double free. Let put_device() handle the cleanup through ulpi_dev_release() and avoid freeing ulpi again in ulpi_register_interface().

Affected products

• Linux kernel: from 4.2 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22 — fixed in 5.10.253, 5.15.203, 6.1.168, 6.12.81, 6.18.22, 6.19.12

How to fix

Upgrade to a fixed version: Linux kernel 5.10.253, 5.15.203, 6.1.168, 6.12.81. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/01af542392b5d41fd659d487015a71f627accce3
• https://git.kernel.org/stable/c/272a9b26c336a295e4e209157fed809706c1b1f7
• https://git.kernel.org/stable/c/2f70ba9dae13a190673cc3f9b4aad52179738f60
• https://git.kernel.org/stable/c/38c28fe25611099230f0965c925499bfcf46a795
• https://git.kernel.org/stable/c/8763f8317bb389aded32a32b08f6751cfff657d2
• https://git.kernel.org/stable/c/a6e5461f076c2ef63159f18e5cdbd30b50f0bc15
• https://git.kernel.org/stable/c/aaeae6533d77e6ed4def85baec01e2815ebbef61
• https://git.kernel.org/stable/c/ee248e6e941e4f2e634df2bd43e5f1ef810ab6df

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