CVE-2026-31602
HighCVSS 7.8Summary
W jądrze Linuxa zidentyfikowano podatność w module ALSA, która dotyczy ograniczenia PTP do jednej strony. Zmiana w kodzie zwiększająca liczbę PTP z 1 do 4 nie była poprawnie obsługiwana przez kartę dźwiękową, co prowadziło do błędów związanych z dostępem do pamięci.
Risk Assessment
Podatność ta może prowadzić do awarii systemu z powodu błędów strony, co wpływa na stabilność działania aplikacji audio. W przypadku przekroczenia limitu alokacji pamięci, może wystąpić krytyczny błąd, który wpłynie na dostępność usług.
Recommendation
Zaleca się przywrócenie wartości CT_PTP_NUM do 1, aby uniknąć problemów z alokacją pamięci. Należy również monitorować systemy pod kątem wystąpienia błędów związanych z PTP.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ALSA: ctxfi: Limit PTP to a single page Commit 391e69143d0a increased CT_PTP_NUM from 1 to 4 to support 256 playback streams, but the additional pages are not used by the card correctly. The CT20K2 hardware already has multiple VMEM_PTPAL registers, but using them separately would require refactoring the entire virtual memory allocation logic. ct_vm_map() always uses PTEs in vm->ptp[0].area regardless of CT_PTP_NUM. On AMD64 systems, a single PTP covers 512 PTEs (2M). When aggregate memory allocations exceed this limit, ct_vm_map() tries to access beyond the allocated space and causes a page fault: BUG: unable to handle page fault for address: ffffd4ae8a10a000 Oops: Oops: 0002 [#1] SMP PTI RIP: 0010:ct_vm_map+0x17c/0x280 [snd_ctxfi] Call Trace: atc_pcm_playback_prepare+0x225/0x3b0 ct_pcm_playback_prepare+0x38/0x60 snd_pcm_do_prepare+0x2f/0x50 snd_pcm_action_single+0x36/0x90 snd_pcm_action_nonatomic+0xbf/0xd0 snd_pcm_ioctl+0x28/0x40 __x64_sys_ioctl+0x97/0xe0 do_syscall_64+0x81/0x610 entry_SYSCALL_64_after_hwframe+0x76/0x7e Revert CT_PTP_NUM to 1. The 256 SRC_RESOURCE_NUM and playback_count remain unchanged.

