CVE-2026-80971 (GCVE-0-2026-80971)
Vulnerability from cvelistv5
Published
2026-09-11 19:42
Modified
2026-10-19 08:45
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: bcd2000: clear the URB pointers on disconnect bcd2000_free_usb_related_resources() frees both URBs and leaves the pointers behind: usb_kill_urb(bcd2k->midi_out_urb); usb_kill_urb(bcd2k->midi_in_urb); usb_free_urb(bcd2k->midi_out_urb); usb_free_urb(bcd2k->midi_in_urb); The rawmidi device outlives that call. A substream that is still open when the device is unplugged reaches bcd2000_midi_send() from the trigger path on close. That function writes to the freed URB and then hands it to the USB core: bcd2k->midi_out_urb->transfer_buffer_length = BUFSIZE; ... ret = usb_submit_urb(bcd2k->midi_out_urb, GFP_ATOMIC); usb_kill_urb() does not stop a later submission either, so a submit that races the disconnect can requeue the URB after it has been reaped. midi_in_urb is exposed the same way: bcd2000_input_complete() resubmits it from the completion handler. KASAN on 7.2.0-rc5 (arm64): BUG: KASAN: slab-use-after-free in bcd2000_midi_send [snd_bcd2000] Write of size 4 at addr ffff00001827d388 by task bpoc/168 __asan_store4 bcd2000_midi_send [snd_bcd2000] bcd2000_midi_output_trigger [snd_bcd2000] snd_rawmidi_kernel_write1 close_substream.part.0 Freed by task 168: usb_free_urb bcd2000_disconnect [snd_bcd2000] BUG: KASAN: slab-use-after-free in usb_submit_urb Read of size 8 at addr ffff00001827d3b8 by task bpoc/168 Clear both pointers after freeing and test them on the paths that can still run. Poison the URBs before freeing them: usb_poison_urb() waits for a running completion handler and rejects any later submission, so after it returns the input path is quiesced and only the rawmidi trigger path can still reach bcd2000_midi_send(). No unpoison is needed; the URBs are freed on the next line. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
References
Impacted products
Vendor Product Version
Linux Linux Version: b47a22290d581277be70e8a597824a4985d39e83
Version: b47a22290d581277be70e8a597824a4985d39e83
Version: b47a22290d581277be70e8a597824a4985d39e83
Version: b47a22290d581277be70e8a597824a4985d39e83
Version: b47a22290d581277be70e8a597824a4985d39e83
Version: b47a22290d581277be70e8a597824a4985d39e83
Version: b47a22290d581277be70e8a597824a4985d39e83
Version: b47a22290d581277be70e8a597824a4985d39e83
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: bcd2000: clear the URB pointers on disconnect\n\nbcd2000_free_usb_related_resources() frees both URBs and leaves the\npointers behind:\n\n\tusb_kill_urb(bcd2k-\u003emidi_out_urb);\n\tusb_kill_urb(bcd2k-\u003emidi_in_urb);\n\n\tusb_free_urb(bcd2k-\u003emidi_out_urb);\n\tusb_free_urb(bcd2k-\u003emidi_in_urb);\n\nThe rawmidi device outlives that call.  A substream that is still open\nwhen the device is unplugged reaches bcd2000_midi_send() from the\ntrigger path on close.  That function writes to the freed URB and then\nhands it to the USB core:\n\n\tbcd2k-\u003emidi_out_urb-\u003etransfer_buffer_length = BUFSIZE;\n\t...\n\tret = usb_submit_urb(bcd2k-\u003emidi_out_urb, GFP_ATOMIC);\n\nusb_kill_urb() does not stop a later submission either, so a submit that\nraces the disconnect can requeue the URB after it has been reaped.\nmidi_in_urb is exposed the same way: bcd2000_input_complete() resubmits\nit from the completion handler.\n\nKASAN on 7.2.0-rc5 (arm64):\n\n  BUG: KASAN: slab-use-after-free in bcd2000_midi_send [snd_bcd2000]\n  Write of size 4 at addr ffff00001827d388 by task bpoc/168\n   __asan_store4\n   bcd2000_midi_send [snd_bcd2000]\n   bcd2000_midi_output_trigger [snd_bcd2000]\n   snd_rawmidi_kernel_write1\n   close_substream.part.0\n  Freed by task 168:\n   usb_free_urb\n   bcd2000_disconnect [snd_bcd2000]\n\n  BUG: KASAN: slab-use-after-free in usb_submit_urb\n  Read of size 8 at addr ffff00001827d3b8 by task bpoc/168\n\nClear both pointers after freeing and test them on the paths that can\nstill run.  Poison the URBs before freeing them: usb_poison_urb() waits\nfor a running completion handler and rejects any later submission, so\nafter it returns the input path is quiesced and only the rawmidi trigger\npath can still reach bcd2000_midi_send().  No unpoison is needed; the\nURBs are freed on the next line.\n\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is reached locally by USBDEVFS_DISCONNECT (or sysfs unbind) on an already-bound Behringer BCD2000 while /dev/snd/midi* is held, then close; there is no network or packet path. This matches AV:L scoring of analogous USB disconnect UAFs (CVE-2025-40283, CVE-2026-64585); physical unplug is only an extra path.\nAC:L - The attacker opens the rawmidi node, optionally enables active sensing, then issues USBDEVFS_DISCONNECT and close; close_substream deterministically writes the freed URB in bcd2000_midi_send(). Concurrent write versus disconnect is also attacker-driven. No uncontrollable race or layout is required to trigger the UAF.\nPR:L - USBDEVFS_DISCONNECT has no capable() check, only write access to /dev/bus/usb that udev uaccess/plugdev rules grant seat users, and snd_rawmidi_open has no capability gate on /dev/snd/midi*. An unprivileged local account suffices; init-namespace root is not required.\nUI:N - The attacker performs open, disconnect, and close on their own fds against an already-attached BCD2000 (DJ workstation/kiosk). No separate victim action such as plugging a device or clicking is required during exploitation.\nS:U - The slab use-after-free of struct urb and the subsequent usb_submit_urb run entirely in the host kernel. This is ordinary local privilege escalation, not a VM, IOMMU, or sandbox boundary escape.\nC:H - KASAN shows a use-after-free read in usb_submit_urb of the dangling midi_out_urb after usb_free_urb. Reclaiming the URB slab lets the attacker supply URB fields that the USB core then reads, enabling kernel disclosure, as with other heap UAFs.\nI:H - bcd2000_midi_send() writes transfer_buffer_length on the freed URB and then submits it. A reclaimed fake URB plus usb_submit_urb is a heap write and control-flow primitive (completion handler/DMA setup) suitable for hijack, so integrity impact is High.\nA:H - The UAF oopses the kernel (KASAN slab-use-after-free in bcd2000_midi_send and usb_submit_urb). The attacker can repeat connect/disconnect to crash on demand, so availability impact is High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:45:55.974Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9af08677aa57debaca5b57c8045c52a83d3dd376"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a77febac6faf6da40fbb4555f703eeb91b58130"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c00004f134fc819f9d9e202c6a64acde0a1f8d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c07aad8a7c9ef8ebc4d03a964b882123a349a2e"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb482a06791d6168beb8c78cc904ac5a5ed96a55"
        },
        {
          "url": "https://git.kernel.org/stable/c/7df3194bdb7479cad9199889655a566a2c0c1d1b"
        },
        {
          "url": "https://git.kernel.org/stable/c/b06ebc7fe25a6af4a9f6e4a3d4236a4178ad4b01"
        },
        {
          "url": "https://git.kernel.org/stable/c/459d3a64766f5ca2f1886daeaf24582831a5f5ab"
        }
      ],
      "title": "ALSA: bcd2000: clear the URB pointers on disconnect",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80971",
    "datePublished": "2026-09-11T19:42:34.441Z",
    "dateReserved": "2026-08-26T14:34:25.810Z",
    "dateUpdated": "2026-10-19T08:45:55.974Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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This matches AV:L scoring of analogous USB disconnect UAFs (CVE-2025-40283, CVE-2026-64585); physical unplug is only an extra path.\\nAC:L - The attacker opens the rawmidi node, optionally enables active sensing, then issues USBDEVFS_DISCONNECT and close; close_substream deterministically writes the freed URB in bcd2000_midi_send(). Concurrent write versus disconnect is also attacker-driven. No uncontrollable race or layout is required to trigger the UAF.\\nPR:L - USBDEVFS_DISCONNECT has no capable() check, only write access to /dev/bus/usb that udev uaccess/plugdev rules grant seat users, and snd_rawmidi_open has no capability gate on /dev/snd/midi*. An unprivileged local account suffices; init-namespace root is not required.\\nUI:N - The attacker performs open, disconnect, and close on their own fds against an already-attached BCD2000 (DJ workstation/kiosk). No separate victim action such as plugging a device or clicking is required during exploitation.\\nS:U - The slab use-after-free of struct urb and the subsequent usb_submit_urb run entirely in the host kernel. This is ordinary local privilege escalation, not a VM, IOMMU, or sandbox boundary escape.\\nC:H - KASAN shows a use-after-free read in usb_submit_urb of the dangling midi_out_urb after usb_free_urb. Reclaiming the URB slab lets the attacker supply URB fields that the USB core then reads, enabling kernel disclosure, as with other heap UAFs.\\nI:H - bcd2000_midi_send() writes transfer_buffer_length on the freed URB and then submits it. A reclaimed fake URB plus usb_submit_urb is a heap write and control-flow primitive (completion handler/DMA setup) suitable for hijack, so integrity impact is High.\\nA:H - The UAF oopses the kernel (KASAN slab-use-after-free in bcd2000_midi_send and usb_submit_urb). The attacker can repeat connect/disconnect to crash on demand, so availability impact is High.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\", \"lessThan\": \"9af08677aa57debaca5b57c8045c52a83d3dd376\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\", \"lessThan\": \"5a77febac6faf6da40fbb4555f703eeb91b58130\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\", \"lessThan\": \"3c00004f134fc819f9d9e202c6a64acde0a1f8d0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\", \"lessThan\": \"6c07aad8a7c9ef8ebc4d03a964b882123a349a2e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\", \"lessThan\": \"eb482a06791d6168beb8c78cc904ac5a5ed96a55\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\", \"lessThan\": \"7df3194bdb7479cad9199889655a566a2c0c1d1b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\", \"lessThan\": \"b06ebc7fe25a6af4a9f6e4a3d4236a4178ad4b01\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\", \"lessThan\": \"459d3a64766f5ca2f1886daeaf24582831a5f5ab\", \"versionType\": \"git\"}], \"programFiles\": [\"sound/usb/bcd2000/bcd2000.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.270\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.221\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.188\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.109\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.50\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.2.*\"}, {\"status\": \"unaffected\", \"version\": \"7.3\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"sound/usb/bcd2000/bcd2000.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9af08677aa57debaca5b57c8045c52a83d3dd376\"}, {\"url\": \"https://git.kernel.org/stable/c/5a77febac6faf6da40fbb4555f703eeb91b58130\"}, {\"url\": \"https://git.kernel.org/stable/c/3c00004f134fc819f9d9e202c6a64acde0a1f8d0\"}, {\"url\": \"https://git.kernel.org/stable/c/6c07aad8a7c9ef8ebc4d03a964b882123a349a2e\"}, {\"url\": \"https://git.kernel.org/stable/c/eb482a06791d6168beb8c78cc904ac5a5ed96a55\"}, {\"url\": \"https://git.kernel.org/stable/c/7df3194bdb7479cad9199889655a566a2c0c1d1b\"}, {\"url\": \"https://git.kernel.org/stable/c/b06ebc7fe25a6af4a9f6e4a3d4236a4178ad4b01\"}, {\"url\": \"https://git.kernel.org/stable/c/459d3a64766f5ca2f1886daeaf24582831a5f5ab\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nALSA: bcd2000: clear the URB pointers on disconnect\\n\\nbcd2000_free_usb_related_resources() frees both URBs and leaves the\\npointers behind:\\n\\n\\tusb_kill_urb(bcd2k-\u003emidi_out_urb);\\n\\tusb_kill_urb(bcd2k-\u003emidi_in_urb);\\n\\n\\tusb_free_urb(bcd2k-\u003emidi_out_urb);\\n\\tusb_free_urb(bcd2k-\u003emidi_in_urb);\\n\\nThe rawmidi device outlives that call.  A substream that is still open\\nwhen the device is unplugged reaches bcd2000_midi_send() from the\\ntrigger path on close.  That function writes to the freed URB and then\\nhands it to the USB core:\\n\\n\\tbcd2k-\u003emidi_out_urb-\u003etransfer_buffer_length = BUFSIZE;\\n\\t...\\n\\tret = usb_submit_urb(bcd2k-\u003emidi_out_urb, GFP_ATOMIC);\\n\\nusb_kill_urb() does not stop a later submission either, so a submit that\\nraces the disconnect can requeue the URB after it has been reaped.\\nmidi_in_urb is exposed the same way: bcd2000_input_complete() resubmits\\nit from the completion handler.\\n\\nKASAN on 7.2.0-rc5 (arm64):\\n\\n  BUG: KASAN: slab-use-after-free in bcd2000_midi_send [snd_bcd2000]\\n  Write of size 4 at addr ffff00001827d388 by task bpoc/168\\n   __asan_store4\\n   bcd2000_midi_send [snd_bcd2000]\\n   bcd2000_midi_output_trigger [snd_bcd2000]\\n   snd_rawmidi_kernel_write1\\n   close_substream.part.0\\n  Freed by task 168:\\n   usb_free_urb\\n   bcd2000_disconnect [snd_bcd2000]\\n\\n  BUG: KASAN: slab-use-after-free in usb_submit_urb\\n  Read of size 8 at addr ffff00001827d3b8 by task bpoc/168\\n\\nClear both pointers after freeing and test them on the paths that can\\nstill run.  Poison the URBs before freeing them: usb_poison_urb() waits\\nfor a running completion handler and rejects any later submission, so\\nafter it returns the input path is quiesced and only the rawmidi trigger\\npath can still reach bcd2000_midi_send().  No unpoison is needed; the\\nURBs are freed on the next line.\\n\\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.270\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.221\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.188\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.109\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"3.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:45:55.974Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-80971\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T08:45:55.974Z\", \"dateReserved\": \"2026-08-26T14:34:25.810Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-09-11T19:42:34.441Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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