Bug 2320515 (CVE-2024-49937) - CVE-2024-49937 kernel: wifi: cfg80211: Set correct chandef when starting CAC
Summary: CVE-2024-49937 kernel: wifi: cfg80211: Set correct chandef when starting CAC
Keywords:
Status: NEW
Alias: CVE-2024-49937
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2321082
Blocks:
TreeView+ depends on / blocked
 
Reported: 2024-10-21 19:07 UTC by OSIDB Bzimport
Modified: 2025-05-13 08:30 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2025:6966 0 None None None 2025-05-13 08:30:21 UTC

Description OSIDB Bzimport 2024-10-21 19:07:16 UTC 
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]
Comment 1 Robb Gatica 2024-10-22 17:05:58 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102127-CVE-2024-49937-74ee@gregkh/T
Comment 2 errata-xmlrpc 2025-05-13 08:30:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:6966 https://access.redhat.com/errata/RHSA-2025:6966
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