ALSA: ump: do not touch legacy_rmidi before it exists

{
  "id": "751df1bb97bef140a6ff34c5646c0a9dea1f9b4658f326c54c5646b456da184a",
  "url": "https://osv.dev/vulnerability/CVE-2026-98086",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ALSA: ump: do not touch legacy_rmidi before it exists",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ALSA: ump: do not touch legacy_rmidi before it exists snd_ump_parse_endpoint() sets ump->parsed on every exit, including error, before the caller attaches the legacy rawmidi device. ump_handle_ep_name_msg() then treats parsed as \"legacy_rmidi is live\" and calls ump_legacy_set_rawmidi_name(), which snprintf()s into ump->legacy_rmidi->name. If a UMP packet arrives in that window (IRQ path from snd_ump_receive), legacy_rmidi is still NULL (KASAN null-ptr-deref in snprintf). Guard the legacy helpers. parsed only means endpoint info was parsed, not that legacy_rmidi exists.",
    "evidence": "osv:CVE-2026-98086",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.158",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.111",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.53",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98086",
      "aliases": [
        "CVE-2026-98086"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "37e0e14128e0685267dc5c037bf655421a6ce2ea"
                },
                {
                  "fixed": "d6f9af093dc91dac8848a01e417b8109c651c0b2"
                },
                {
                  "fixed": "1c8e01792adf91879322f1ad752f1814de8b7e7d"
                },
                {
                  "fixed": "228075f31b141395233218712242913125ace4e0"
                },
                {
                  "fixed": "a4cef20cd473e0640fefd38094d4baac0ec76ae3"
                },
                {
                  "fixed": "adeee7187694719890aaffdc14b7e89cfd736f1d"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98086.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.5.0"
                },
                {
                  "fixed": "6.6.158"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.111"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.53"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98086.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.364555225Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1c8e01792adf91879322f1ad752f1814de8b7e7d",
        "https://git.kernel.org/stable/c/228075f31b141395233218712242913125ace4e0",
        "https://git.kernel.org/stable/c/a4cef20cd473e0640fefd38094d4baac0ec76ae3",
        "https://git.kernel.org/stable/c/adeee7187694719890aaffdc14b7e89cfd736f1d",
        "https://git.kernel.org/stable/c/d6f9af093dc91dac8848a01e417b8109c651c0b2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98086.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98086",
        "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/2026/98xxx/CVE-2026-98086.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98086",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 489796,
  "published_at": "2026-09-25T10:24:21.086+00:00"
}