Answer in brief
CVE-2026-90220 records a Unknown severity vulnerability in ALSA: seq: Don't leak the extension cell pointer in the bounce payload. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=93d260ce43a81df579c98bee92b91316df9c1c57 <42c3f856d13a91a0d4c302a0c6854813621136db || >=dae23c545eb5a2be3b27a82fd0f611894fb8ab69 <b1e8d40663997aacaa198f37ce6893e07aaba77a || >=efc86691e4d8083d9e380ea95042c2cf679f65fd <6e6e471eef1d5d8cb056c7d364023fe048249204 || >=efc86691e4d8083d9e380ea95042c2cf679f65fd <59e1592d3c270ff4642d5d6dc55c545306eb0693 || 0527a56cb327021cb73167cfddf0e49efa043500 || >=6.12.97 <6.12.110 || >=6.18.40 <6.18.52 || >=7.1.5 <7.2 | 42c3f856d13a91a0d4c302a0c6854813621136db, b1e8d40663997aacaa198f37ce6893e07aaba77a, 6e6e471eef1d5d8cb056c7d364023fe048249204, 59e1592d3c270ff4642d5d6dc55c545306eb0693, 6.12.110, 6.18.52, 7.2 |
| Linux/Linuxgeneric | 7.2 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
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.
Quoted source text, attributed separately from HOL analysis.