CVE-2026-98086 (GCVE-0-2026-98086)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:24 – Updated: 2026-09-25 10:24
VLAI
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 37e0e14128e0685267dc5c037bf655421a6ce2ea , < 1c8e01792adf91879322f1ad752f1814de8b7e7d (git)
Affected: 37e0e14128e0685267dc5c037bf655421a6ce2ea , < 228075f31b141395233218712242913125ace4e0 (git)
Affected: 37e0e14128e0685267dc5c037bf655421a6ce2ea , < a4cef20cd473e0640fefd38094d4baac0ec76ae3 (git)
Affected: 37e0e14128e0685267dc5c037bf655421a6ce2ea , < adeee7187694719890aaffdc14b7e89cfd736f1d (git)
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Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/core/ump.c"
          ],
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: ump: do not touch legacy_rmidi before it exists\n\nsnd_ump_parse_endpoint() sets ump-\u003eparsed on every exit, including\nerror, before the caller attaches the legacy rawmidi device.\nump_handle_ep_name_msg() then treats parsed as \"legacy_rmidi is live\"\nand calls ump_legacy_set_rawmidi_name(), which snprintf()s into\nump-\u003elegacy_rmidi-\u003ename. If a UMP packet arrives in that window\n(IRQ path from snd_ump_receive), legacy_rmidi is still NULL\n(KASAN null-ptr-deref in snprintf).\n\nGuard the legacy helpers. parsed only means endpoint info was\nparsed, not that legacy_rmidi exists."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T10:24:21.086Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/adeee7187694719890aaffdc14b7e89cfd736f1d"
        }
      ],
      "title": "ALSA: ump: do not touch legacy_rmidi before it exists",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98086",
    "datePublished": "2026-09-25T10:24:21.086Z",
    "dateReserved": "2026-09-25T10:19:56.075Z",
    "dateUpdated": "2026-09-25T10:24:21.086Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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      "date": "2026-09-26",
      "epss": "0.002",
      "percentile": "0.08842"
    },
    "nvd": {
      "cve": {
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: ump: do not touch legacy_rmidi before it exists\n\nsnd_ump_parse_endpoint() sets ump-\u003eparsed on every exit, including\nerror, before the caller attaches the legacy rawmidi device.\nump_handle_ep_name_msg() then treats parsed as \"legacy_rmidi is live\"\nand calls ump_legacy_set_rawmidi_name(), which snprintf()s into\nump-\u003elegacy_rmidi-\u003ename. If a UMP packet arrives in that window\n(IRQ path from snd_ump_receive), legacy_rmidi is still NULL\n(KASAN null-ptr-deref in snprintf).\n\nGuard the legacy helpers. parsed only means endpoint info was\nparsed, not that legacy_rmidi exists."
          }
        ],
        "id": "CVE-2026-98086",
        "lastModified": "2026-09-25T11:17:38.200",
        "metrics": {},
        "published": "2026-09-25T11:17:38.200",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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