CVE-2026-74339
CVE CVE-2026-74339EUVD EUVD-2026-59486Published 2026-08-15T05:58:29.000ZLast changed 2026-08-17T05:17:31.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Clear variable event pointer on read snd_seq_read() copies a queued variable-length event header to userspace before expanding the payload. Queued variable-length events use SNDRV_SEQ_EXT_CHAINED internally, and data.ext.ptr points at the first extension cell. The read side strips SNDRV_SEQ_EXT_* bits from data.ext.len before the copy, but it leaves data.ext.ptr untouched. A userspace sequencer client can therefore write a direct variable event to itself and read back the extension-cell kernel address from the returned header. Clear the temporary header pointer before copy_to_user(). The original queued event remains unchanged and is still passed to snd_seq_expand_var_event(), so payload expansion keeps using the internal chain.
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 patch: 5.15.212; 2.6.12; patch: 6.12.97; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <705dd6dcbc0ea87351c660c1a6443f85f1001c76; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31b; patch: 7.2; patch: 0; patch: 6.1.178; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e0c3edd86414534cfd179fefe45b38c29c01ae7a; patch: 7.1.5; patch: 6.6.145; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <14fe4f75fd5309d6b75f8e840ada88912b374207; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f29243c211928114f8b906e0a3fee77c236f14c8; patch: 6.18.40; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6b52211eba213c461f68922708a99d8190c1fcd5; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c2ac9287e89916da684c2a548798351e63eb59ee
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
Does this concern one of your customers?
This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.
Try it for 28 daysPatchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.