{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98741",
  "modified": "2026-10-19T04:30:01Z",
  "upstream": [
    "CVE-2026-98741"
  ],
  "published": "2026-10-18T15:54:51Z",
  "summary": "ALSA: ua101: reject mismatched capture/playback packet sizes",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: ua101: reject mismatched capture/playback packet sizes\n\ndetect_usb_format() cross-checks bSubframeSize, bBitResolution and\ntSamFreq between the capture and playback interfaces, but never relates\nthe two endpoints' wMaxPacketSize and bNrChannels.  Each playback URB\ngets a buffer of ua->playback.max_packet_bytes, while the number of\nbytes written into it is derived from the capture stream:\ncapture_urb_complete() computes frames from the received capture packet\nand capture.frame_bytes, and start_usb_playback() and playback_work()\nmultiply that by playback.frame_bytes.\n\nA device declaring a large capture wMaxPacketSize with few capture\nchannels and a small playback wMaxPacketSize with many playback channels\ntherefore memset()s and memcpy()s past the end of the playback buffer,\nin open() of the PCM node the driver registers during probe.\nusb_submit_urb() rejects the over-long iso_frame_desc[0].length with\n-EMSGSIZE, but only after the write.\n\nReject such descriptors at probe time.  Genuine UA-101/UA-1000 hardware\ndeclares proportional packet sizes and is unaffected.\n\n  BUG: KASAN: slab-out-of-bounds in start_usb_playback (sound/usb/misc/ua101.c:586)\n  Write of size 2048 at addr ffff8881098f3c00 by task exploit/5021\n  Call Trace:\n   __asan_memset (mm/kasan/shadow.c:84)\n   start_usb_playback (sound/usb/misc/ua101.c:586)\n   playback_pcm_open (sound/usb/misc/ua101.c:679)\n   snd_pcm_open_substream (sound/core/pcm_native.c:2829)\n   snd_pcm_open (sound/core/pcm_native.c:2865 sound/core/pcm_native.c:2932)\n   snd_pcm_playback_open (sound/core/pcm_native.c:2891)\n   snd_open (sound/core/sound.c:166)\n   chrdev_open (fs/char_dev.c:411)\n   do_dentry_open (fs/open.c:996)\n   vfs_open (fs/open.c:1101)\n   path_openat (fs/namei.c:4837 fs/namei.c:5000)\n   do_file_open (fs/namei.c:5029)\n   do_sys_openat2 (fs/open.c:1417)\n   __x64_sys_openat (fs/open.c:1423 fs/open.c:1439 fs/open.c:1434)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n\n  The buggy address belongs to the object at ffff8881098f3c00\n   which belongs to the cache kmalloc-192 of size 192\n  The buggy address is located 0 bytes inside of\n   allocated 168-byte region [ffff8881098f3c00, ffff8881098f3ca8)",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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