CVE-2026-64479: Linux kernel · ALSA: seq: Fix uninitialised heap leak in snd_seq_event_dup()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 3 Nov 2026, 19:29 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 25 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.
What to do
AI-suggested
A fix has been implemented in the Linux kernel to correct the condition that zeroes the trailing word in snd_seq_event_dup(), preventing the uninitialized heap leak. Users should apply the updated Linux kernel version containing this fix. No additional mitigation is indicated or required beyond applying the official patch.
Description
A heap information leak vulnerability exists in the Linux kernel ALSA sequencer subsystem due to an uninitialized memory word in snd_seq_event_dup(). This flaw allows stale kernel heap data to be copied to user space when legacy events are delivered unconverted to UMP clients, potentially exposing sensitive kernel memory contents to unprivileged users.
References
- git.kernel.org/stable/c/d7649aa11089a93ea2285c210397aa67e5800766 (opens in a new tab)
- git.kernel.org/stable/c/a224c84e5d3d35708c082c84ad12d81d90762195 (opens in a new tab)
- git.kernel.org/stable/c/ea672a9f6cc38f06fe69dd2c257ef8a3d4db179a (opens in a new tab)
- git.kernel.org/stable/c/fb1aa5082847b98f44f9c6272aee9d0dca9244f0 (opens in a new tab)
- git.kernel.org/stable/c/651ba82fe2a144bc7356d940bfd235c3810b0549 (opens in a new tab)
- git.kernel.org/stable/c/6ded42615fa1f4949925afd0a8a9e1ab3bf96202 (opens in a new tab)
- git.kernel.org/stable/c/435990e25bf1f4af3e6df12a6fbfd1f7ba4a97d4 (opens in a new tab)