CVE-2026-90220 (GCVE-0-2026-90220)
Vulnerability from cvelistv5
Published
2026-09-17 16:07
Modified
2026-10-21 12:50
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Don't leak the extension cell pointer in the bounce payload The bounce_error_event() embeds the failed event in the bounce payload by pointing data.ext.ptr at it. When that event is a queued variable-length event, its own data.ext.ptr holds the address of its first extension cell, put there by snd_seq_event_dup(). The payload goes out verbatim through snd_seq_expand_var_event(), so the address reaches userspace. That is the same address commit 705dd6dcbc0e ("ALSA: seq: Clear variable event pointer on read") removed from the event header. The read path still clears it there, just above the call that expands the payload. Embed a sanitised copy instead, treated exactly as snd_seq_read() treats the header. A stack copy is enough because delivery is synchronous and snd_seq_event_dup() copies before returning. An unprivileged client reaches this by setting SNDRV_SEQ_FILTER_BOUNCE, queueing a variable-length event to a port that does not exist and reading the bounce back. Eight bytes on 64-bit, from its own pool.
References
Impacted products
Vendor Product Version
Linux Linux Version: 93d260ce43a81df579c98bee92b91316df9c1c57
Version: dae23c545eb5a2be3b27a82fd0f611894fb8ab69
Version: efc86691e4d8083d9e380ea95042c2cf679f65fd
Version: efc86691e4d8083d9e380ea95042c2cf679f65fd
Version: eae296065ede41a24040e6a7c909ec970f78b4eb
Version: 0527a56cb327021cb73167cfddf0e49efa043500
Version: 6.12.97   ≤
Version: 6.18.40   ≤
Version: 6.6.160   ≤
Version: 7.1.5   ≤
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{
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      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: Don\u0027t leak the extension cell pointer in the bounce payload\n\nThe bounce_error_event() embeds the failed event in the bounce payload\nby pointing data.ext.ptr at it.  When that event is a queued\nvariable-length event, its own data.ext.ptr holds the address of its\nfirst extension cell, put there by snd_seq_event_dup().  The payload\ngoes out verbatim through snd_seq_expand_var_event(), so the address\nreaches userspace.\n\nThat is the same address commit 705dd6dcbc0e (\"ALSA: seq: Clear\nvariable event pointer on read\") removed from the event header.  The\nread path still clears it there, just above the call that expands the\npayload.\n\nEmbed a sanitised copy instead, treated exactly as snd_seq_read()\ntreats the header.  A stack copy is enough because delivery is\nsynchronous and snd_seq_event_dup() copies before returning.\n\nAn unprivileged client reaches this by setting SNDRV_SEQ_FILTER_BOUNCE,\nqueueing a variable-length event to a port that does not exist and\nreading the bounce back.  Eight bytes on 64-bit, from its own pool."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:50:31.238Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/42c3f856d13a91a0d4c302a0c6854813621136db"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1e8d40663997aacaa198f37ce6893e07aaba77a"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e6e471eef1d5d8cb056c7d364023fe048249204"
        },
        {
          "url": "https://git.kernel.org/stable/c/59e1592d3c270ff4642d5d6dc55c545306eb0693"
        }
      ],
      "title": "ALSA: seq: Don\u0027t leak the extension cell pointer in the bounce payload",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90220",
    "datePublished": "2026-09-17T16:07:31.423Z",
    "dateReserved": "2026-09-11T19:38:34.793Z",
    "dateUpdated": "2026-10-21T12:50:31.238Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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