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ALSA: seq: Don't leak the extension cell pointer in the bounce payload

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-90220

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90220

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "93d260ce43a81df579c98bee92b91316df9c1c57",
        "lessThan": "42c3f856d13a91a0d4c302a0c6854813621136db",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "dae23c545eb5a2be3b27a82fd0f611894fb8ab69",
        "lessThan": "b1e8d40663997aacaa198f37ce6893e07aaba77a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "efc86691e4d8083d9e380ea95042c2cf679f65fd",
        "lessThan": "6e6e471eef1d5d8cb056c7d364023fe048249204",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "efc86691e4d8083d9e380ea95042c2cf679f65fd",
        "lessThan": "59e1592d3c270ff4642d5d6dc55c545306eb0693",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eae296065ede41a24040e6a7c909ec970f78b4eb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0527a56cb327021cb73167cfddf0e49efa043500",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.12.97",
        "lessThan": "6.12.110",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.18.40",
        "lessThan": "6.18.52",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.6.160",
        "lessThan": "6.7",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "7.1.5",
        "lessThan": "7.2",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "sound/core/seq/seq_clientmgr.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "7.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "7.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "sound/core/seq/seq_clientmgr.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90220

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#48637 · Revision 1
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