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CVE-2026-46109: usb: ulpi: fix memory leak on ulpi_register() error paths

• 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 2026-06-24
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: usb: ulpi: fix memory leak on ulpi_register() error paths Commit 01af542392b5 ("usb: ulpi: fix double free in ulpi_register_interface() error path") removed kfree(ulpi) from ulpi_register_interface() to fix a double-free when device_register() fails. But when ulpi_of_register() or ulpi_read_id() fail before device_register() is called, the ulpi allocation is leaked. Add kfree(ulpi) on both error paths to properly clean up the allocation.

Affected products

• Linux kernel: from 5.10.253 before 5.10.258; from 5.15.203 before 5.15.209; from 6.1.168 before 6.1.175; from 6.6.134 before 6.6.140; from 6.12.81 before 6.12.88; from 6.18.22 before 6.18.30 — fixed in 5.10.258, 5.15.209, 6.1.175, 6.12.88, 6.18.30, 6.6.140

How to fix

Upgrade to a fixed version: Linux kernel 5.10.258, 5.15.209, 6.1.175, 6.12.88. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0b9fcab1b8608d429e5f239afb197de928d4de7d
• https://git.kernel.org/stable/c/0c2c0c6820fe96fa4be0a0499f8d3f3321b9af6c
• https://git.kernel.org/stable/c/2a71e01b2cf9b4329ff67102c1bea7448c2a2d2d
• https://git.kernel.org/stable/c/7bd61ed0bf9f4f1f2673d489b3bda1555b48d054
• https://git.kernel.org/stable/c/b0c0d44adb55c66663886cb6e30ee92cbb0f5385
• https://git.kernel.org/stable/c/be2c1d825f54277472c87019e82013ac534ddc4c
• https://git.kernel.org/stable/c/f1b855c00988a9cb41134cab7cf9faedba775dd9
• https://git.kernel.org/stable/c/f30ccfc2985590b33a23a3d8bed7ca16c0af551b

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