CVE-2022-49942

Conditional kernel crash via disconnected IBSS channel switch

Published Jun 18, 2025 · Updated May 11, 2026

NULL-pointer dereference in Linux kernel mac80211 allows local users to trigger a kernel warning through a disconnected IBSS channel switch. ieee80211_ibss_finish_csa() generates a CSA beacon without verifying an existing connection, so cfg80211_get_bss() returns NULL and ieee80211_ibss_csa_beacon() reaches WARN_ON(). The path requires a local user to complete a channel switch while an IBSS interface is disconnected; systems configured to panic on warnings can crash, while default configurations log the warning.

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

NULL-pointer dereference in Linux kernel mac80211 allows local users to trigger a kernel warning through a disconnected IBSS channel switch. ieee80211_ibss_finish_csa() generates a CSA beacon without verifying an existing connection, so cfg80211_get_bss() returns NULL and ieee80211_ibss_csa_beacon() reaches WARN_ON(). The path requires a local user to complete a channel switch while an IBSS interface is disconnected; systems configured to panic on warnings can crash, while default configurations log the warning.

The record

CVE
CVE-2022-49942
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3.13
  2. Affected versionversion=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0
  3. Affected versionversion=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <1691a48aef0a82d1754b9853dae7e3f5cacdf70b
  4. Affected versionversion=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <552ba102a6898630a7d16887f29e606d6fabe508
  5. Affected versionversion=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <66689c5c02acd4d76c28498fe220998610aec61e
  6. Affected versionversion=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <864e280cb3a9a0f5212b16ef5057c4e692f7039d
  7. Affected versionversion=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <cdb9a8da9b84800eb15506cd9363cf0cf059e677
  8. Affected versionversion=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <d9eb37db6a28b59a95a3461450ee209654c5f95b
  9. Affected versionversion=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <dd649b49219a0388cc10fc40e4c2ea681566a780

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.13; version=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0; version=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <1691a48aef0a82d1754b9853dae7e3f5cacdf70b; version=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <552ba102a6898630a7d16887f29e606d6fabe508; version=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <66689c5c02acd4d76c28498fe220998610aec61e; version=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <864e280cb3a9a0f5212b16ef5057c4e692f7039d; version=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <cdb9a8da9b84800eb15506cd9363cf0cf059e677; version=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <d9eb37db6a28b59a95a3461450ee209654c5f95b; version=cd7760e62c2ac8581f050b2d36501d1a60beaf83 <dd649b49219a0388cc10fc40e4c2ea681566a780

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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