Vulnerability-Lookup

CVE-2026-64479 (GCVE-0-2026-64479)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

Title

ALSA: seq: Fix uninitialised heap leak in snd_seq_event_dup()

Summary

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Fix uninitialised heap leak in snd_seq_event_dup() snd_seq_event_dup() copies an incoming event into a pool cell and, in the UMP-enabled build, clears the trailing cell->ump.raw.extra word that the memcpy() did not cover. The guard deciding whether to clear it compares the copied size against sizeof(cell->event): memcpy(&cell->ump, event, size); if (size < sizeof(cell->event)) cell->ump.raw.extra = 0; For a legacy (non-UMP) event, size == sizeof(struct snd_seq_event) == sizeof(cell->event), so the condition is false and the extra word keeps stale data. The cell pool is allocated with kvmalloc() (not zeroed) and cells are reused via a free list, so that word holds uninitialised heap or leftover event data. When such a cell is delivered to a UMP client (client->midi_version > 0) that set SNDRV_SEQ_FILTER_NO_CONVERT -- so the legacy event reaches it unconverted -- snd_seq_read() reads it out as the larger struct snd_seq_ump_event and copies the stale word to user space, a 4-byte kernel heap infoleak to an unprivileged /dev/snd/seq client. Compare against sizeof(cell->ump) instead, so the trailing word is zeroed for every event shorter than the UMP cell.

Severity

No CVSS data available.

Assigner

Linux

References

7 references

URL	Tags
https://git.kernel.org/stable/c/d7649aa11089a93ea…
https://git.kernel.org/stable/c/a224c84e5d3d35708…
https://git.kernel.org/stable/c/ea672a9f6cc38f06f…
https://git.kernel.org/stable/c/fb1aa5082847b98f4…
https://git.kernel.org/stable/c/651ba82fe2a144bc7…
https://git.kernel.org/stable/c/6ded42615fa1f4949…
https://git.kernel.org/stable/c/435990e25bf1f4af3…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6389f2c135311c4ce7c08c3b29145c8f95aacf1f , < d7649aa11089a93ea2285c210397aa67e5800766 (git) Affected: d7e2ce72833bb23a82b4201fbed7214cc04a4a8c , < a224c84e5d3d35708c082c84ad12d81d90762195 (git) Affected: 46397622a3fa8372b8fda0f04b33d16923b03b1b , < ea672a9f6cc38f06fe69dd2c257ef8a3d4db179a (git) Affected: 46397622a3fa8372b8fda0f04b33d16923b03b1b , < fb1aa5082847b98f44f9c6272aee9d0dca9244f0 (git) Affected: 46397622a3fa8372b8fda0f04b33d16923b03b1b , < 651ba82fe2a144bc7356d940bfd235c3810b0549 (git) Affected: 46397622a3fa8372b8fda0f04b33d16923b03b1b , < 6ded42615fa1f4949925afd0a8a9e1ab3bf96202 (git) Affected: 46397622a3fa8372b8fda0f04b33d16923b03b1b , < 435990e25bf1f4af3e6df12a6fbfd1f7ba4a97d4 (git)
Linux	Linux	Affected: 6.5 Unaffected: 0 , < 6.5 (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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              "status": "unaffected",
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              "versionType": "semver"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: Fix uninitialised heap leak in snd_seq_event_dup()\n\nsnd_seq_event_dup() copies an incoming event into a pool cell and, in\nthe UMP-enabled build, clears the trailing cell-\u003eump.raw.extra word that\nthe memcpy() did not cover.  The guard deciding whether to clear it\ncompares the copied size against sizeof(cell-\u003eevent):\n\n\tmemcpy(\u0026cell-\u003eump, event, size);\n\tif (size \u003c sizeof(cell-\u003eevent))\n\t\tcell-\u003eump.raw.extra = 0;\n\nFor a legacy (non-UMP) event, size == sizeof(struct snd_seq_event) ==\nsizeof(cell-\u003eevent), so the condition is false and the extra word keeps\nstale data.  The cell pool is allocated with kvmalloc() (not zeroed) and\ncells are reused via a free list, so that word holds uninitialised heap\nor leftover event data.\n\nWhen such a cell is delivered to a UMP client (client-\u003emidi_version \u003e 0)\nthat set SNDRV_SEQ_FILTER_NO_CONVERT -- so the legacy event reaches it\nunconverted -- snd_seq_read() reads it out as the larger struct\nsnd_seq_ump_event and copies the stale word to user space, a 4-byte\nkernel heap infoleak to an unprivileged /dev/snd/seq client.\n\nCompare against sizeof(cell-\u003eump) instead, so the trailing word is zeroed\nfor every event shorter than the UMP cell."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:51:41.006Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/d7649aa11089a93ea2285c210397aa67e5800766"
        },
        {
          "url": "https://git.kernel.org/stable/c/a224c84e5d3d35708c082c84ad12d81d90762195"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea672a9f6cc38f06fe69dd2c257ef8a3d4db179a"
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        },
        {
          "url": "https://git.kernel.org/stable/c/435990e25bf1f4af3e6df12a6fbfd1f7ba4a97d4"
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      ],
      "title": "ALSA: seq: Fix uninitialised heap leak in snd_seq_event_dup()",
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    "cveId": "CVE-2026-64479",
    "datePublished": "2026-07-25T08:51:41.006Z",
    "dateReserved": "2026-07-19T15:36:31.791Z",
    "dateUpdated": "2026-07-25T08:51:41.006Z",
    "state": "PUBLISHED"
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      "date": "2026-07-26",
      "epss": "0.00181",
      "percentile": "0.07933"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64479\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:33.493\",\"lastModified\":\"2026-07-25T10:17:33.493\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nALSA: seq: Fix uninitialised heap leak in snd_seq_event_dup()\\n\\nsnd_seq_event_dup() copies an incoming event into a pool cell and, in\\nthe UMP-enabled build, clears the trailing cell-\u003eump.raw.extra word that\\nthe memcpy() did not cover.  The guard deciding whether to clear it\\ncompares the copied size against sizeof(cell-\u003eevent):\\n\\n\\tmemcpy(\u0026cell-\u003eump, event, size);\\n\\tif (size \u003c sizeof(cell-\u003eevent))\\n\\t\\tcell-\u003eump.raw.extra = 0;\\n\\nFor a legacy (non-UMP) event, size == sizeof(struct snd_seq_event) ==\\nsizeof(cell-\u003eevent), so the condition is false and the extra word keeps\\nstale data.  The cell pool is allocated with kvmalloc() (not zeroed) and\\ncells are reused via a free list, so that word holds uninitialised heap\\nor leftover event data.\\n\\nWhen such a cell is delivered to a UMP client (client-\u003emidi_version \u003e 0)\\nthat set SNDRV_SEQ_FILTER_NO_CONVERT -- so the legacy event reaches it\\nunconverted -- snd_seq_read() reads it out as the larger struct\\nsnd_seq_ump_event and copies the stale word to user space, a 4-byte\\nkernel heap infoleak to an unprivileged /dev/snd/seq client.\\n\\nCompare against sizeof(cell-\u003eump) instead, so the trailing word is zeroed\\nfor every event shorter than the UMP cell.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"sound/core/seq/seq_memory.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6389f2c135311c4ce7c08c3b29145c8f95aacf1f\",\"lessThan\":\"d7649aa11089a93ea2285c210397aa67e5800766\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7e2ce72833bb23a82b4201fbed7214cc04a4a8c\",\"lessThan\":\"a224c84e5d3d35708c082c84ad12d81d90762195\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"46397622a3fa8372b8fda0f04b33d16923b03b1b\",\"lessThan\":\"ea672a9f6cc38f06fe69dd2c257ef8a3d4db179a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"46397622a3fa8372b8fda0f04b33d16923b03b1b\",\"lessThan\":\"fb1aa5082847b98f44f9c6272aee9d0dca9244f0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"46397622a3fa8372b8fda0f04b33d16923b03b1b\",\"lessThan\":\"651ba82fe2a144bc7356d940bfd235c3810b0549\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"46397622a3fa8372b8fda0f04b33d16923b03b1b\",\"lessThan\":\"6ded42615fa1f4949925afd0a8a9e1ab3bf96202\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"46397622a3fa8372b8fda0f04b33d16923b03b1b\",\"lessThan\":\"435990e25bf1f4af3e6df12a6fbfd1f7ba4a97d4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"sound/core/seq/seq_memory.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.5\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.5\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/435990e25bf1f4af3e6df12a6fbfd1f7ba4a97d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/651ba82fe2a144bc7356d940bfd235c3810b0549\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6ded42615fa1f4949925afd0a8a9e1ab3bf96202\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a224c84e5d3d35708c082c84ad12d81d90762195\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d7649aa11089a93ea2285c210397aa67e5800766\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ea672a9f6cc38f06fe69dd2c257ef8a3d4db179a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fb1aa5082847b98f44f9c6272aee9d0dca9244f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:58:34Z",
      "cve": "CVE-2026-64479",
      "id": "CVE-2026-64479",
      "initial_release_date": "2026-07-25T15:58:34Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64479",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64479.json",
      "version": "2"
    }
  }
}

GHSA-6695-37P4-X7M5

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

ALSA: seq: Fix uninitialised heap leak in snd_seq_event_dup()

snd_seq_event_dup() copies an incoming event into a pool cell and, in the UMP-enabled build, clears the trailing cell->ump.raw.extra word that the memcpy() did not cover. The guard deciding whether to clear it compares the copied size against sizeof(cell->event):

memcpy(&cell->ump, event, size);
if (size < sizeof(cell->event))
    cell->ump.raw.extra = 0;

For a legacy (non-UMP) event, size == sizeof(struct snd_seq_event) == sizeof(cell->event), so the condition is false and the extra word keeps stale data. The cell pool is allocated with kvmalloc() (not zeroed) and cells are reused via a free list, so that word holds uninitialised heap or leftover event data.

When such a cell is delivered to a UMP client (client->midi_version > 0) that set SNDRV_SEQ_FILTER_NO_CONVERT -- so the legacy event reaches it unconverted -- snd_seq_read() reads it out as the larger struct snd_seq_ump_event and copies the stale word to user space, a 4-byte kernel heap infoleak to an unprivileged /dev/snd/seq client.

Compare against sizeof(cell->ump) instead, so the trailing word is zeroed for every event shorter than the UMP cell.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64479"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:33Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: Fix uninitialised heap leak in snd_seq_event_dup()\n\nsnd_seq_event_dup() copies an incoming event into a pool cell and, in\nthe UMP-enabled build, clears the trailing cell-\u003eump.raw.extra word that\nthe memcpy() did not cover.  The guard deciding whether to clear it\ncompares the copied size against sizeof(cell-\u003eevent):\n\n\tmemcpy(\u0026cell-\u003eump, event, size);\n\tif (size \u003c sizeof(cell-\u003eevent))\n\t\tcell-\u003eump.raw.extra = 0;\n\nFor a legacy (non-UMP) event, size == sizeof(struct snd_seq_event) ==\nsizeof(cell-\u003eevent), so the condition is false and the extra word keeps\nstale data.  The cell pool is allocated with kvmalloc() (not zeroed) and\ncells are reused via a free list, so that word holds uninitialised heap\nor leftover event data.\n\nWhen such a cell is delivered to a UMP client (client-\u003emidi_version \u003e 0)\nthat set SNDRV_SEQ_FILTER_NO_CONVERT -- so the legacy event reaches it\nunconverted -- snd_seq_read() reads it out as the larger struct\nsnd_seq_ump_event and copies the stale word to user space, a 4-byte\nkernel heap infoleak to an unprivileged /dev/snd/seq client.\n\nCompare against sizeof(cell-\u003eump) instead, so the trailing word is zeroed\nfor every event shorter than the UMP cell.",
  "id": "GHSA-6695-37p4-x7m5",
  "modified": "2026-07-25T12:31:37Z",
  "published": "2026-07-25T12:31:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64479"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/435990e25bf1f4af3e6df12a6fbfd1f7ba4a97d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/651ba82fe2a144bc7356d940bfd235c3810b0549"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ded42615fa1f4949925afd0a8a9e1ab3bf96202"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a224c84e5d3d35708c082c84ad12d81d90762195"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d7649aa11089a93ea2285c210397aa67e5800766"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea672a9f6cc38f06fe69dd2c257ef8a3d4db179a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb1aa5082847b98f44f9c6272aee9d0dca9244f0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64479 (GCVE-0-2026-64479)

GHSA-6695-37P4-X7M5

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Nomenclature