CVE-2026-90220
CVE CVE-2026-90220EUVD EUVD-2026-81813Published 2026-09-17T16:07:31.000Z
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux 0527a56cb327021cb73167cfddf0e49efa043500; 6.12.97 <6.12.110; efc86691e4d8083d9e380ea95042c2cf679f65fd <59e1592d3c270ff4642d5d6dc55c545306eb0693; patch: 0; patch: 6.12.110; 93d260ce43a81df579c98bee92b91316df9c1c57 <42c3f856d13a91a0d4c302a0c6854813621136db; patch: 6.18.52; efc86691e4d8083d9e380ea95042c2cf679f65fd <6e6e471eef1d5d8cb056c7d364023fe048249204; patch: 7.3-rc1; 7.2; dae23c545eb5a2be3b27a82fd0f611894fb8ab69 <b1e8d40663997aacaa198f37ce6893e07aaba77a; patch: 7.2.6; 6.18.40 <6.18.52; 7.1.5 <7.2
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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