{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "46757a3e7d50dac923888e7fbe68377736f13c70"
            },
            {
              "fixed": "65aceb45ca91ddb7f7ed178821f481b34da35543"
            },
            {
              "fixed": "5da21a434171e8ecf1d992c6f1d84c0c706fd395"
            },
            {
              "fixed": "6db3c1d7e2872c9904e05ca8e0515920776a3c9c"
            },
            {
              "fixed": "918b8d231c571c50a00efe92ffc8404a537a0490"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.14.0"
            },
            {
              "fixed": "6.18.47"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.11"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.2.0"
            },
            {
              "fixed": "7.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80816.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: FCP: Use a private URB for the notification endpoint\n\nfcp_init_notify() used mixer-\u003eurb, which snd_usb_mixer_status_create()\nallocates for the optional UAC2 status interrupt endpoint and mixer.c\nkills, resubmits and frees. On a device with that endpoint,\nfcp_init_notify()'s \"already set up\" early return fires on the status\nURB and returns success without doing anything. No FCP notification\nURB is submitted, and cmd_done is left zeroed because it is\ninitialised past that early return and nowhere else. fcp_init() then\nissues init1_opcode and wait_for_completion_timeout() would crash\nadding to the zeroed wait.head. fcp_cleanup_urb() would also kill and\nfree mixer.c's status URB.\n\nUse a separate URB in fcp_data, and initialise cmd_done in\nfcp_init_private() where fcp_data is allocated. fcp_init_notify() is\nreached again after suspend via fcp_reinit(), and the URB kill path in\nfcp_notify() completes cmd_done, leaving a stale count that would\nsatisfy the next command's wait before the device ACKs. Use\nreinit_completion() to clear it.",
  "id": "CVE-2026-80816",
  "modified": "2026-09-06T03:30:47.771931654Z",
  "published": "2026-09-04T15:13:37.310Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5da21a434171e8ecf1d992c6f1d84c0c706fd395"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65aceb45ca91ddb7f7ed178821f481b34da35543"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6db3c1d7e2872c9904e05ca8e0515920776a3c9c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/918b8d231c571c50a00efe92ffc8404a537a0490"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80816.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80816"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ALSA: FCP: Use a private URB for the notification endpoint"
}