ALSA: usb-audio: qcom: reject stream disable with no active interface

{
  "id": "1360568f592d4bb5663e2320a2904e41857eae3439811997887af88e3a65cbe8",
  "url": "https://osv.dev/vulnerability/CVE-2026-72446",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ALSA: usb-audio: qcom: reject stream disable with no active interface",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: qcom: reject stream disable with no active interface handle_uaudio_stream_req() resolves an interface index with info_idx_from_ifnum(), which returns -EINVAL when no interface matches. The enable branch and the response: cleanup label both guard against a negative index, but the disable branch does not: it forms info = &uadev[pcm_card_num].info[info_idx] and dereferences it. uadev[].info is a pointer allocated only when a stream is first enabled, so a negative info_idx on the disable path is unsafe in two ways: - If the card was never enabled, .info is NULL and &info[-EINVAL] is a wild pointer; reading info->data_ep_pipe faults (kernel oops). - If the card was enabled at least once (.info allocated) and the disable names an interface that does not match, &info[-EINVAL] points before the allocation; info->data_ep_pipe / info->sync_ep_pipe are an out-of-bounds slab read and, when non-zero, an out-of-bounds 4-byte write (both pipe fields are cleared to 0). That is memory corruption, not just a NULL dereference. The request is reachable from unprivileged local userspace over AF_QIPCRTR. Reject a disable request with no resolved interface, matching the guard the enable path already has.",
    "evidence": "osv:CVE-2026-72446",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.40",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-72446",
      "aliases": [
        "CVE-2026-72446"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "326bbc348298ab0946c5560defe024a5f6ef28bb"
                },
                {
                  "fixed": "25a867aa5e67a84333fa6e5c21292c5bcff86b90"
                },
                {
                  "fixed": "a22356d1f731553e99aa2707dbd38c659bdd28d8"
                },
                {
                  "fixed": "bdb640be82e645e2828731648f485224d0c2587b"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72446.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.18.40"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72446.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.975420769Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/25a867aa5e67a84333fa6e5c21292c5bcff86b90",
        "https://git.kernel.org/stable/c/a22356d1f731553e99aa2707dbd38c659bdd28d8",
        "https://git.kernel.org/stable/c/bdb640be82e645e2828731648f485224d0c2587b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72446.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72446",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72446.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72446",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499176,
  "published_at": "2026-08-15T05:56:56.47+00:00"
}