CVE-2026-53161

취약점 유형

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: fix use-after-free of fastrpc_user in workqueue context There is a race between fastrpc_device_release() and the workqueue that processes DSP responses. When the user closes the file descriptor, fastrpc_device_release() frees the fastrpc_user structure. Concurrently, an in-flight DSP invocation can complete and fastrpc_rpmsg_callback() schedules context cleanup via schedule_work(&ctx->put_work). If the workqueue runs fastrpc_context_free() in parallel with or after fastrpc_device_release() has freed the user structure, it dereferences the freed fastrpc_user. Depending on the state of the context at the time of the race, any one of the following accesses can be hit: 1. fastrpc_buf_free() calls fastrpc_ipa_to_dma_addr(buf->fl->cctx, ...) to strip the SID bits from the stored IOVA before passing the physical address to dma_free_coherent(). 2. fastrpc_free_map() reads map->fl->cctx->vmperms[0].vmid to reconstruct the source permission bitmask needed for the qcom_scm_assign_mem() call that returns memory from the DSP VM back to HLOS. 3. fastrpc_free_map() acquires map->fl->lock to safely remove the map no

영향받는 제품

• linux linux_kernel

참고 자료

• https://git.kernel.org/stable/c/5278ccd357e0d7aeeb1e76c0f3e0e02894a9897c
• https://git.kernel.org/stable/c/c6e5c2be09f814377d7f1ce97370a5b7b3e02814
• https://git.kernel.org/stable/c/d42679eef34dd590b694ce3b666c5e2ba10cd4bf
• https://git.kernel.org/stable/c/df08fadcf0e5f3708365ec3b6d30b5aafd98bea1
• https://git.kernel.org/stable/c/e1e3a05efe5954d5bad01157d79429d39a67a7ae
• https://git.kernel.org/stable/c/e85eb5feca8e254905ffa6c57a3c99c89a674a0f