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().
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jun 20, 2025 | Jun 20, 2025 |
| Dell Powerstore Dsa2025429 | — | Upgrade Dell PowerStoreOS to the latest version | Dec 3, 2025 | Dec 2, 2025 |
| Dell Powerstore Dsa2026039 | — | Upgrade Dell PowerStoreOS to the latest version | Jan 13, 2026 | Jan 6, 2026 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 18, 2025 |
| Ubuntu | — | Upgrade linux-realtimeUpgrade linux-lowlatencyUpgrade linux-aws-5.15Upgrade linux-aws-hweUpgrade linux-intel-iotgUpgrade linux-gkeUpgrade linux-oracleUpgrade linux-ibmUpgrade linux-oracle-5.15Upgrade linux-kvmUpgrade linux-fipsUpgrade linux-raspiUpgrade linux-oracle-5.4Upgrade linux-nvidiaUpgrade linux-aws-5.4Upgrade linux-gcp-5.4Upgrade linux-aws-fipsUpgrade linux-hwe-5.4Upgrade linux-intel-iotg-5.15Upgrade linux-gkeopUpgrade linux-azure-5.15Upgrade linux-azure-fipsUpgrade linux-gcp-5.15Upgrade linux-riscv-5.15Upgrade linux-gcpUpgrade linux-lowlatency-hwe-5.15Upgrade linux-hweUpgrade linux-gcp-4.15Upgrade linux-azure-4.15Upgrade linux-hwe-5.15Upgrade linux-ibm-5.4Upgrade linux-azureUpgrade linux-azure-fdeUpgrade linux-raspi-5.4Upgrade linux-gcp-fipsUpgrade linux-awsUpgrade linux-bluefieldUpgrade linuxUpgrade linux-azure-5.4Upgrade linux-iot | Jun 26, 2025 | Jun 18, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Jun 18, 2025 |
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