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In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Clear variable event pointer on read snd_seq_read() copies a queued… (CVE-2026-74339)

0
Unknown
Published: 08/15/2026 (08/15/2026, 06:32:30 UTC)
Source: GCVE Database

Description

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.

Technical Details

Gcve Source
db.gcve.eu
Osv Id
GHSA-5rp2-cp2v-9mcx
Osv Schema Version
1.4.0
Aliases
["CVE-2026-74339"]
Ecosystems
[]
Database Specific Severity
null
Cvss Version
null

Threat ID: 6a808b6abf8831d5394f6f90

Added to database: 08/15/2026, 15:53:14 UTC

Last updated: 08/15/2026, 15:54:49 UTC

Views: 1

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