CVE-2024-49937

wifi: cfg80211: Set correct chandef when starting CAC

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: Set correct chandef when starting CAC When starting CAC in a mode other than AP mode, it return a "WARNING: CPU: 0 PID: 63 at cfg80211_chandef_dfs_usable+0x20/0xaf [cfg80211]" caused by the chandef.chan being null at the end of CAC. Solution: Ensure the channel definition is set for the different modes when starting CAC to avoid getting a NULL 'chan' at the end of CAC. Call Trace: ? show_regs.part.0+0x14/0x16 ? __warn+0x67/0xc0 ? cfg80211_chandef_dfs_usable+0x20/0xaf [cfg80211] ? report_bug+0xa7/0x130 ? exc_overflow+0x30/0x30 ? handle_bug+0x27/0x50 ? exc_invalid_op+0x18/0x60 ? handle_exception+0xf6/0xf6 ? exc_overflow+0x30/0x30 ? cfg80211_chandef_dfs_usable+0x20/0xaf [cfg80211] ? exc_overflow+0x30/0x30 ? cfg80211_chandef_dfs_usable+0x20/0xaf [cfg80211] ? regulatory_propagate_dfs_state.cold+0x1b/0x4c [cfg80211] ? cfg80211_propagate_cac_done_wk+0x1a/0x30 [cfg80211] ? process_one_work+0x165/0x280 ? worker_thread+0x120/0x3f0 ? kthread+0xc2/0xf0 ? process_one_work+0x280/0x280 ? kthread_complete_and_exit+0x20/0x20 ? ret_from_fork+0x19/0x24 [shorten subject, remove OCB, reorder cases to match previous list]

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/95f32191e50b75e0f75fae1bb925cdf51d8df0a3	patch
https://git.kernel.org/stable/c/04053e55dd50741cf6c59b9bbaa4238218c05c70	patch
https://git.kernel.org/stable/c/f4dbfda159e43d49b43003cc3c2914751939035f	patch
https://git.kernel.org/stable/c/c628026563f4ea9e0413dd4b69429e4a1db240b1	patch
https://git.kernel.org/stable/c/20361712880396e44ce80aaeec2d93d182035651	patch

Frequently Asked Questions

What is the severity of CVE-2024-49937?: CVE-2024-49937 has been scored as a medium severity vulnerability.
How to fix CVE-2024-49937?: To fix CVE-2024-49937, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-49937 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-49937 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-49937?: CVE-2024-49937 affects Linux Linux, Linux Linux.