CVE-2022-49942

wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected

State: Published
Severity: Not scored
Published: Jun 18, 2025
Updated: May 11, 2026
Reserved: Jun 18, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected

When we are not connected to a channel, sending channel "switch" announcement doesn't make any sense.

The BSS list is empty in that case. This causes the for loop in cfg80211_get_bss() to be bypassed, so the function returns NULL (check line 1424 of net/wireless/scan.c), causing the WARN_ON() in ieee80211_ibss_csa_beacon() to get triggered (check line 500 of net/mac80211/ibss.c), which was consequently reported on the syzkaller dashboard.

Thus, check if we have an existing connection before generating the CSA beacon in ieee80211_ibss_finish_csa().

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before cdb9a8da9b84800eb15506cd9363cf0cf059e677Affected cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before 1691a48aef0a82d1754b9853dae7e3f5cacdf70bAffected cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before d9eb37db6a28b59a95a3461450ee209654c5f95bAffected cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before 66689c5c02acd4d76c28498fe220998610aec61eAffected cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before dd649b49219a0388cc10fc40e4c2ea681566a780Affected cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before 552ba102a6898630a7d16887f29e606d6fabe508Affected cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before 864e280cb3a9a0f5212b16ef5057c4e692f7039dAffected cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before 15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0Affected
LinuxLinux	3.13Affected before 3.13Not affected 4.9.328 through 4.9.Not affected 4.14.293 through 4.14.Not affected 4.19.258 through 4.19.Not affected 5.4.213 through 5.4.Not affected 5.10.142 through 5.10.Not affected 5.15.66 through 5.15.Not affected 5.19.8 through 5.19.*Not affected 6.0 and laterNot affected

Product

Versions

LinuxLinux

cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before cdb9a8da9b84800eb15506cd9363cf0cf059e677Affected
cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before 1691a48aef0a82d1754b9853dae7e3f5cacdf70bAffected
cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before d9eb37db6a28b59a95a3461450ee209654c5f95bAffected
cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before 66689c5c02acd4d76c28498fe220998610aec61eAffected
cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before dd649b49219a0388cc10fc40e4c2ea681566a780Affected
cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before 552ba102a6898630a7d16887f29e606d6fabe508Affected
cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before 864e280cb3a9a0f5212b16ef5057c4e692f7039dAffected
cd7760e62c2ac8581f050b2d36501d1a60beaf83 to before 15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0Affected

LinuxLinux

3.13Affected
before 3.13Not affected
4.9.328 through 4.9.*Not affected
4.14.293 through 4.14.*Not affected
4.19.258 through 4.19.*Not affected
5.4.213 through 5.4.*Not affected
5.10.142 through 5.10.*Not affected
5.15.66 through 5.15.*Not affected
5.19.8 through 5.19.*Not affected
6.0 and laterNot affected

References

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