CVE-2026-98741 (GCVE-0-2026-98741)
Vulnerability from cvelistv5
Published
2026-10-18 15:47
Modified
2026-10-30 12:39
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: ua101: reject mismatched capture/playback packet sizes detect_usb_format() cross-checks bSubframeSize, bBitResolution and tSamFreq between the capture and playback interfaces, but never relates the two endpoints' wMaxPacketSize and bNrChannels. Each playback URB gets a buffer of ua->playback.max_packet_bytes, while the number of bytes written into it is derived from the capture stream: capture_urb_complete() computes frames from the received capture packet and capture.frame_bytes, and start_usb_playback() and playback_work() multiply that by playback.frame_bytes. A device declaring a large capture wMaxPacketSize with few capture channels and a small playback wMaxPacketSize with many playback channels therefore memset()s and memcpy()s past the end of the playback buffer, in open() of the PCM node the driver registers during probe. usb_submit_urb() rejects the over-long iso_frame_desc[0].length with -EMSGSIZE, but only after the write. Reject such descriptors at probe time. Genuine UA-101/UA-1000 hardware declares proportional packet sizes and is unaffected. BUG: KASAN: slab-out-of-bounds in start_usb_playback (sound/usb/misc/ua101.c:586) Write of size 2048 at addr ffff8881098f3c00 by task exploit/5021 Call Trace: __asan_memset (mm/kasan/shadow.c:84) start_usb_playback (sound/usb/misc/ua101.c:586) playback_pcm_open (sound/usb/misc/ua101.c:679) snd_pcm_open_substream (sound/core/pcm_native.c:2829) snd_pcm_open (sound/core/pcm_native.c:2865 sound/core/pcm_native.c:2932) snd_pcm_playback_open (sound/core/pcm_native.c:2891) snd_open (sound/core/sound.c:166) chrdev_open (fs/char_dev.c:411) do_dentry_open (fs/open.c:996) vfs_open (fs/open.c:1101) path_openat (fs/namei.c:4837 fs/namei.c:5000) do_file_open (fs/namei.c:5029) do_sys_openat2 (fs/open.c:1417) __x64_sys_openat (fs/open.c:1423 fs/open.c:1439 fs/open.c:1434) do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) The buggy address belongs to the object at ffff8881098f3c00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes inside of allocated 168-byte region [ffff8881098f3c00, ffff8881098f3ca8)
References
Impacted products
Vendor Product Version
Linux Linux Version: 63978ab3e3e963db28093b53bb4598f2702e1ad7
Version: 63978ab3e3e963db28093b53bb4598f2702e1ad7
Version: 63978ab3e3e963db28093b53bb4598f2702e1ad7
Version: 63978ab3e3e963db28093b53bb4598f2702e1ad7
Version: 63978ab3e3e963db28093b53bb4598f2702e1ad7
Version: 63978ab3e3e963db28093b53bb4598f2702e1ad7
Version: 63978ab3e3e963db28093b53bb4598f2702e1ad7
Version: 63978ab3e3e963db28093b53bb4598f2702e1ad7
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{
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027 wMaxPacketSize and bNrChannels.  Each playback URB\ngets a buffer of ua-\u003eplayback.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)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:39:15.151Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b54976c81a6b8cae311b75be1a4cda444689bca0"
        },
        {
          "url": "https://git.kernel.org/stable/c/a2d326b3f6d470ea4bfde00245794e0dc6dbbc3d"
        },
        {
          "url": "https://git.kernel.org/stable/c/0a6a5eecc92c13f936d8d90975116d6bbdf4f876"
        },
        {
          "url": "https://git.kernel.org/stable/c/ada5ded765f059a6e3036e69ca350449442af0fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd3a7bf0d988b0878a1957df150edb35f81db87e"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb0c7fda59cf650076f8ed5b949a6c8441aa3606"
        },
        {
          "url": "https://git.kernel.org/stable/c/4294fe57048594a9e158b61c967bb7f943cda477"
        },
        {
          "url": "https://git.kernel.org/stable/c/86f86e6fdedc33c5b8d38b9208b350f8accf57ee"
        }
      ],
      "title": "ALSA: ua101: reject mismatched capture/playback packet sizes",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98741",
    "datePublished": "2026-10-18T15:47:26.283Z",
    "dateReserved": "2026-09-25T10:25:14.367Z",
    "dateUpdated": "2026-10-30T12:39:15.151Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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