CVE-2026-89625

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> HID: sony: fix UAF of ghl_poke_timer / ghl_urb at driver unbind<br /> <br /> For GHL (Guitar Hero Live) dongles, sony_probe() arms a periodic timer:<br /> ghl_magic_poke() (the timer callback) submits sc-&gt;ghl_urb, and the URB<br /> completion ghl_magic_poke_cb() re-arms the timer with mod_timer().<br /> <br /> sony_remove() drained the timer with timer_delete_sync() and then freed<br /> the URB with usb_free_urb():<br /> <br /> timer_delete_sync(&amp;sc-&gt;ghl_poke_timer);<br /> usb_free_urb(sc-&gt;ghl_urb);<br /> <br /> timer_delete_sync() does not block re-arming, and while the URB is in<br /> flight the timer is not pending, so the sync delete is a no-op. A URB<br /> completion that runs after the delete re-arms the timer, and usb_free_urb()<br /> only drops a reference -- it does not kill an in-flight URB. sc is<br /> allocated with devm_kzalloc() and freed once sony_remove() returns, so the<br /> re-armed ghl_poke_timer (embedded in sc) then fires on freed memory, a<br /> use-after-free from timer softirq. This is a disconnect/rmmod race.<br /> <br /> Poison the URB first, then shut the timer down, before freeing the URB.<br /> usb_poison_urb() kills any in-flight URB and permanently rejects further<br /> submissions, so a poke timer that is still pending cannot re-submit the<br /> URB from ghl_magic_poke() in the window before timer_shutdown_sync() runs.<br /> usb_kill_urb() would not suffice: it only cancels the in-flight URB and<br /> leaves it submittable once it returns, so the pending timer could<br /> re-submit it and put a fresh URB in flight over the freed sc.<br /> timer_shutdown_sync() then drains any last callback and blocks re-arming.<br /> The probe error path is unaffected: it is only reached before the timer<br /> is armed.<br /> <br /> Reproduced under KASAN on next-20260710 via dummy_hcd + raw-gadget<br /> emulation of the GHL PS4 dongle (VID 0x1430 / PID 0x07bb): hid-sony binds<br /> and arms the poke timer, the poke URB is held in flight, the driver is<br /> unbound (freeing sc), then the URB is released. The completion re-arms the<br /> timer on the freed sc, and the re-armed timer fires ~8 s later:<br /> <br /> BUG: KASAN: slab-use-after-free in ghl_magic_poke+0x98/0xb0<br /> Read of size 8 at addr ffff88810b02fd50 by task swapper/0/0<br /> ghl_magic_poke+0x98/0xb0<br /> call_timer_fn+0x35/0x2b0<br /> __run_timers+0x69c/0x9a0<br /> run_timer_softirq+0x173/0x2a0<br /> Allocated by task 169: sony_probe<br /> Freed by task 338: devres_release_group