CVE-2026-90220
Description
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.
How to fix
- Linux Linuxc92b2e6e418a3885758438dddcead6e954a9e095, 42c3f856d13a91a0d4c302a0c6854813621136db, b1e8d40663997aacaa198f37ce6893e07aaba77a, 6e6e471eef1d5d8cb056c7d364023fe048249204, 59e1592d3c270ff4642d5d6dc55c545306eb0693, 6.12.110, 6.18.52, 6.7, 7.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 05e2358fec8812c37516ccea63bc4b9956d864ba ≤ v < c92b2e6e418a3885758438dddcead6e954a9e095, 93d260ce43a81df579c98bee92b91316df9c1c57 ≤ v < 42c3f856d13a91a0d4c302a0c6854813621136db, dae23c545eb5a2be3b27a82fd0f611894fb8ab69 ≤ v < b1e8d40663997aacaa198f37ce6893e07aaba77a, efc86691e4d8083d9e380ea95042c2cf679f65fd ≤ v < 6e6e471eef1d5d8cb056c7d364023fe048249204, efc86691e4d8083d9e380ea95042c2cf679f65fd ≤ v < 59e1592d3c270ff4642d5d6dc55c545306eb0693, eae296065ede41a24040e6a7c909ec970f78b4eb, 0527a56cb327021cb73167cfddf0e49efa043500, 6.12.97 ≤ v < 6.12.110, 6.18.40 ≤ v < 6.18.52, 6.6.160 ≤ v < 6.7, 7.1.5 ≤ v < 7.2, 7.2 | c92b2e6e418a3885758438dddcead6e954a9e095, 42c3f856d13a91a0d4c302a0c6854813621136db, b1e8d40663997aacaa198f37ce6893e07aaba77a, 6e6e471eef1d5d8cb056c7d364023fe048249204, 59e1592d3c270ff4642d5d6dc55c545306eb0693, 6.12.110, 6.18.52, 6.7, 7.2 |
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