CVE-2024-49937

Kernel warning via unset CAC channel definition

Published Oct 21, 2024 · Updated May 23, 2026

A NULL channel-definition flaw in affected Linux kernels allows local users to interrupt service after non-AP CAC completion. The nl80211 CAC-start path leaves the channel-definition channel unset outside AP mode, and CAC completion passes that NULL field to cfg80211_chandef_dfs_usable. Reaching the fault requires local low-privileged access and a non-AP wireless CAC workflow; the published trace shows a kernel warning, with no reported data exposure or code execution.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL channel-definition flaw in affected Linux kernels allows local users to interrupt service after non-AP CAC completion. The nl80211 CAC-start path leaves the channel-definition channel unset outside AP mode, and CAC completion passes that NULL field to cfg80211_chandef_dfs_usable. Reaching the fault requires local low-privileged access and a non-AP wireless CAC workflow; the published trace shows a kernel warning, with no reported data exposure or code execution.

The record

CVE
CVE-2024-49937
Published
Oct 21, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.19.2 <5.20
  2. Affected versionversion=6.0
  3. Affected versionversion=7a53ad13c09150076b7ddde96c2dfc5622c90b45
  4. Affected versionversion=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <04053e55dd50741cf6c59b9bbaa4238218c05c70
  5. Affected versionversion=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <20361712880396e44ce80aaeec2d93d182035651
  6. Affected versionversion=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <95f32191e50b75e0f75fae1bb925cdf51d8df0a3
  7. Affected versionversion=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <c628026563f4ea9e0413dd4b69429e4a1db240b1
  8. Affected versionversion=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <f4dbfda159e43d49b43003cc3c2914751939035f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19.2 <5.20; version=6.0; version=7a53ad13c09150076b7ddde96c2dfc5622c90b45; version=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <04053e55dd50741cf6c59b9bbaa4238218c05c70; version=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <20361712880396e44ce80aaeec2d93d182035651; version=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <95f32191e50b75e0f75fae1bb925cdf51d8df0a3; version=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <c628026563f4ea9e0413dd4b69429e4a1db240b1; version=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <f4dbfda159e43d49b43003cc3c2914751939035f

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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