CVE-2026-90220 (GCVE-0-2026-90220)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:07 – Updated: 2026-10-30 12:34
VLAI
Title
ALSA: seq: Don't leak the extension cell pointer in the bounce payload
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 05e2358fec8812c37516ccea63bc4b9956d864ba , < c92b2e6e418a3885758438dddcead6e954a9e095 (git)
Affected: 93d260ce43a81df579c98bee92b91316df9c1c57 , < 42c3f856d13a91a0d4c302a0c6854813621136db (git)
Affected: dae23c545eb5a2be3b27a82fd0f611894fb8ab69 , < b1e8d40663997aacaa198f37ce6893e07aaba77a (git)
Affected: efc86691e4d8083d9e380ea95042c2cf679f65fd , < 6e6e471eef1d5d8cb056c7d364023fe048249204 (git)
Affected: efc86691e4d8083d9e380ea95042c2cf679f65fd , < 59e1592d3c270ff4642d5d6dc55c545306eb0693 (git)
Affected: eae296065ede41a24040e6a7c909ec970f78b4eb (git)
Affected: 0527a56cb327021cb73167cfddf0e49efa043500 (git)
Affected: 6.12.97 , < 6.12.110 (semver)
Affected: 6.18.40 , < 6.18.52 (semver)
Affected: 6.6.160 , < 6.7 (semver)
Affected: 7.1.5 , < 7.2 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 7.2
Unaffected: 0 , < 7.2 (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "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."
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      "product_status:known_affected": "183",
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      "cve": "CVE-2026-90220",
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}



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