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CVE-2026-99184

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Opublikowano: Przetłumaczono: NVD NIST

Streszczenie

W jądrze Linux w sterowniku accel/rocket funkcja rocket_remove() zmniejsza liczbę rdzeni (num_cores) przed wyszukaniem slotu, przez co ostatni rdzeń nie jest odnajdywany i nie jest usuwany. Prowadzi to do wycieku stanu i w konsekwencji do zapisu poza tablicą rdev->cores przy ponownym bindowaniu rdzeni na RK3588.

Ocena ryzyka

Podatność może powodować ciche uszkodzenie pamięci jądra (zapis poza tablicą), co w skrajnych przypadkach prowadzi do niestabilności systemu lub wykonania niekontrolowanego kodu. Dotyczy głównie platform z akceleratorem Rockchip NPU (np. RK3588) przy operacjach unbind/rebind.

Rekomendacja

Zaktualizuj jądro Linux do wersji zawierającej poprawkę, która zapisuje liczbę zaalokowanych slotów i przeszukuje wszystkie z nich podczas usuwania rdzenia. Unikaj ręcznego odłączania i ponownego podłączania rdzeni NPU do czasu wdrożenia aktualizacji.

Inne podatności w Linux kernel

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Oryginalny opis (angielski, źródło NVD)

In the Linux kernel, the following vulnerability has been resolved: accel/rocket: search every core slot when a core is removed rocket_remove() decrements rdev->num_cores for each core it removes, while find_core_for_dev() searches slots 0 to num_cores - 1. Unbinding the cores in the order they were bound therefore loses the last one: by the time it is removed the search range has already shrunk past its slot, so find_core_for_dev() returns -1 and rocket_remove() gives up without doing anything. num_cores never reaches zero, rocket_device_fini() never runs, and the file-scoped rdev keeps pointing at a device that is going away. Binding the cores again starts from that stale count, because rocket_probe() takes rdev->num_cores as the slot to fill. On an RK3588, which describes three cores, the second round lands on slots 1, 2 and 3 while rdev->cores was allocated with room for three: rocket fdab0000.npu: Rockchip NPU core 1 version: 1179210309 rocket fdac0000.npu: Rockchip NPU core 2 version: 1179210309 rocket fdad0000.npu: Rockchip NPU core 3 version: 1179210309 The write to rdev->cores[3] is past the end of the array. Nothing in tree reads the core array often enough to notice, so the overrun is silent today. It turned up while testing a devfreq series on top of this, where a worker walks every core a few times a second, and UBSAN caught the first bool it read out of the overrun entry: UBSAN: invalid-load in drivers/accel/rocket/rocket_devfreq.c:47:10 load of value 5 is not a valid value for type '_Bool' Workqueue: devfreq_wq devfreq_monitor Record how many slots were allocated and search all of them. Every core is then found on removal, num_cores reaches zero, the device is torn down and a later bind starts from a clean rdev. This does not make unbinding a single core out of several work. probe still takes num_cores as the slot to fill, so rebinding one core while its siblings stay bound would write over a slot that is already in use, and rocket_open() still reaches for cores[0] whether or not anything is there. Both of those want more thought than a fix should carry. Found by unbinding and rebinding all three cores on an Orange Pi 5 Plus. With this applied, 25 unbind/rebind rounds and 5 module unload/reload rounds run clean there: the cores land in slots 0, 1 and 2 every time, whichever order they are bound in, and the shared supply goes back to a single user after each round.

Dane podatności pochodzą z NVD (NIST) · CISA KEV · EPSS