CVE-2024-49937: Linux kernel · wifi: cfg80211: Set correct chandef when starting CAC
Source GCVE Database
Not known to be exploited · CVSS 5.5 Medium.
Data as of 30 Oct 2026, 00:00 UTC
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitation evidence
Disclosed: evidence found.
CVE published 21 Oct 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
AI-suggested
Until a fix is applied, avoid starting CAC in modes other than AP mode to prevent triggering the kernel warning and instability. Monitor vendor channels for an official fix.
Description
CVE-2024-49937 is a medium severity vulnerability in the Linux kernel's wifi cfg80211 component. It occurs when starting Channel Availability Check (CAC) in modes other than AP mode, causing a null channel definition that triggers a kernel warning and potential instability. The issue is due to the chandef.chan being null at the end of CAC. The fix involves ensuring the channel definition is properly set for different modes when starting CAC.
References
- nvd.nist.gov/vuln/detail/CVE-2024-49937 (opens in a new tab)
- git.kernel.org/stable/c/04053e55dd50741cf6c59b9bbaa4238218c05c70 (opens in a new tab)
- git.kernel.org/stable/c/20361712880396e44ce80aaeec2d93d182035651 (opens in a new tab)
- git.kernel.org/stable/c/95f32191e50b75e0f75fae1bb925cdf51d8df0a3 (opens in a new tab)
- git.kernel.org/stable/c/c628026563f4ea9e0413dd4b69429e4a1db240b1 (opens in a new tab)
- git.kernel.org/stable/c/f4dbfda159e43d49b43003cc3c2914751939035f (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/01/msg00001.html (opens in a new tab)