CVE-2026-80971 (GCVE-0-2026-80971)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-14 11:59
VLAI
Title
ALSA: bcd2000: clear the URB pointers on disconnect
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>
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b47a22290d581277be70e8a597824a4985d39e83 , < 9af08677aa57debaca5b57c8045c52a83d3dd376 (git)
Affected: b47a22290d581277be70e8a597824a4985d39e83 , < 5a77febac6faf6da40fbb4555f703eeb91b58130 (git)
Affected: b47a22290d581277be70e8a597824a4985d39e83 , < 3c00004f134fc819f9d9e202c6a64acde0a1f8d0 (git)
Affected: b47a22290d581277be70e8a597824a4985d39e83 , < 6c07aad8a7c9ef8ebc4d03a964b882123a349a2e (git)
Affected: b47a22290d581277be70e8a597824a4985d39e83 , < eb482a06791d6168beb8c78cc904ac5a5ed96a55 (git)
Affected: b47a22290d581277be70e8a597824a4985d39e83 , < 7df3194bdb7479cad9199889655a566a2c0c1d1b (git)
Affected: b47a22290d581277be70e8a597824a4985d39e83 , < b06ebc7fe25a6af4a9f6e4a3d4236a4178ad4b01 (git)
Affected: b47a22290d581277be70e8a597824a4985d39e83 , < 459d3a64766f5ca2f1886daeaf24582831a5f5ab (git)
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Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "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": "2026-09-14T11:59:18.213Z",
        "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"
        },
        {
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        },
        {
          "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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    "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": "2026-09-14T11:59:18.213Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80971",
      "date": "2026-09-21",
      "epss": "0.00159",
      "percentile": "0.05506"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-15T01:50:33.000Z",
      "cve": "CVE-2026-80971",
      "id": "msrc_CVE-2026-80971",
      "initial_release_date": "2026-09-13T01:07:37.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ALSA: bcd2000: clear the URB pointers on disconnect",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80971.json",
      "version": "3"
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          {
            "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"
          }
        ],
        "id": "CVE-2026-80971",
        "lastModified": "2026-09-14T13:18:51.890",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-11T20:19:03.233",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3c00004f134fc819f9d9e202c6a64acde0a1f8d0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/459d3a64766f5ca2f1886daeaf24582831a5f5ab"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5a77febac6faf6da40fbb4555f703eeb91b58130"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6c07aad8a7c9ef8ebc4d03a964b882123a349a2e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7df3194bdb7479cad9199889655a566a2c0c1d1b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9af08677aa57debaca5b57c8045c52a83d3dd376"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b06ebc7fe25a6af4a9f6e4a3d4236a4178ad4b01"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/eb482a06791d6168beb8c78cc904ac5a5ed96a55"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T18:26:21+00:00",
      "cve": "CVE-2026-80971",
      "id": "CVE-2026-80971",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ALSA: bcd2000: clear the URB pointers on disconnect",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80971.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:06:13Z",
      "cve": "CVE-2026-80971",
      "id": "CVE-2026-80971",
      "initial_release_date": "2026-09-16T00:06:13Z",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "88",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80971",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80971.json",
      "version": "2"
    }
  }
}



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