CVE-2024-26943

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nouveau/dmem: maneja el error de asignación de kcalloc() El kcalloc() en nouveau_dmem_evict_chunk() devolverá nulo si la memoria física se ha agotado. Como resultado, si eliminamos la referencia a src_pfns, dst_pfns o dma_addrs, se producirán errores de desreferenciación del puntero nulo. Además, la GPU está desapareciendo. Si kcalloc() falla, no podremos desalojar todas las páginas que asignan un fragmento. Entonces este parche agrega un indicador __GFP_NOFAIL en kcalloc(). Finalmente, como no es necesario tener memoria físicamente contigua, este parche cambia kcalloc() a kvcalloc() para evitar asignaciones fallidas.

In the Linux kernel, the following vulnerability has been resolved: nouveau/dmem: handle kcalloc() allocation failure The kcalloc() in nouveau_dmem_evict_chunk() will return null if the physical memory has run out. As a result, if we dereference src_pfns, dst_pfns or dma_addrs, the null pointer dereference bugs will happen. Moreover, the GPU is going away. If the kcalloc() fails, we could not evict all pages mapping a chunk. So this patch adds a __GFP_NOFAIL flag in kcalloc(). Finally, as there is no need to have physically contiguous memory, this patch switches kcalloc() to kvcalloc() in order to avoid failing allocations.

Ziming Zhang discovered that the DRM driver for VMware Virtual GPU did not properly handle certain error conditions, leading to a NULL pointer dereference. A local attacker could possibly trigger this vulnerability to cause a denial of service. Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux kernel contained a race condition during device removal, leading to a use- after-free vulnerability. A physically proximate attacker could possibly use this to cause a denial of service.