Linux Kernel: realtek_cr Driver UAF on USB Disconnect
CVE-2026-90029 Published on September 16, 2026
usb: storage: realtek_cr: fix use-after-free on disconnect
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.
Products Associated with CVE-2026-90029
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Affected Versions
Linux:- Version e931830bb877e2aad9a1be83506f9bdb26c91e4e and below 7c4e2f964c65dea4ea22386799d5fb10ef1e3e54 is affected.
- Version e931830bb877e2aad9a1be83506f9bdb26c91e4e and below cae9dbba6adae21a04a3bd045e07b489847ff2c6 is affected.
- Version e931830bb877e2aad9a1be83506f9bdb26c91e4e and below 4ffee1aebb0c0ffcda9faffd17834ea9b00d42cc is affected.
- Version 3.1 is affected.
- Before 3.1 is unaffected.
- Version 6.18.51, <= 6.18.* is unaffected.
- Version 7.2.5, <= 7.2.* is unaffected.
- Version 7.3-rc2, <= * is unaffected.