CVE-2026-90029

Summary

In the Linux kernel, the following vulnerability has been resolved:

usb: storage: realtek_cr: fix use-after-free on disconnect

realtek_cr_destructor() calls timer_delete() before the chip containing the timer is freed. The timer callback may still be running and can rearm itself, resulting in a use-after-free.

Use timer_shutdown_sync() to wait for the callback and prevent further rearming. Do this unconditionally because ss_en may be changed after the timer is armed.

Move timer_setup() into init_realtek_cr() so the timer is initialized before any failure path can invoke the destructor.

Found by static analysis.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/7c4e2f964c65dea4ea22386799d5fb10ef1e3e54
• https://git.kernel.org/stable/c/cae9dbba6adae21a04a3bd045e07b489847ff2c6
• https://git.kernel.org/stable/c/4ffee1aebb0c0ffcda9faffd17834ea9b00d42cc

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