{"id":"CVE-2026-98406","summary":"wifi: mac80211: avoid WARN in set_bitrate_mask when sdata not in driver","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: avoid WARN in set_bitrate_mask when sdata not in driver\n\nieee80211_set_bitrate_mask() checks if the interface is running via\nieee80211_sdata_running(), but it does not check if the interface is\nstill present in the driver.\n\nWhen sdata is running but IEEE80211_SDATA_IN_DRIVER is not set, the\ncall reaches drv_set_bitrate_mask() in driver-ops.h which hits\n\n  wlan1: Failed check-sdata-in-driver check, flags: 0x0\n  WARNING: net/mac80211/driver-ops.h:884 at drv_set_bitrate_mask\n\nSyzkaller triggers this via wext SIOCSIWRATE ioctl. The Call Trace shows\nwext_ioctl_dispatch() in wext-core.c dispatching the ioctl, calling\nioctl_standard_call() for SIOCSIWRATE, which calls cfg80211_wext_siwrate()\nin wext-compat.c. That builds a bitrate mask and calls\nrdev_set_bitrate_mask() which ends up in ieee80211_set_bitrate_mask() in\ncfg.c. The interface is marked running via SDATA_STATE_RUNNING but\nflags is 0, so check_sdata_in_driver() fails.\n\nWhen the interface is being torn down, or when wext ioctl is issued\nduring interface bringup before drv_add_interface() sets IN_DRIVER, the\nrunning check passes while IN_DRIVER is clear.\n\nCheck IEEE80211_SDATA_IN_DRIVER in ieee80211_set_bitrate_mask() before\ncalling the driver, returning -ENETDOWN. This avoids the WARN_ONCE in\ndriver-ops.h and matches other cfg.c operations that bail early when not\nin driver.\n\nThis change should be safe because wiphy mutex is held in\ncfg80211_wext_siwrate() via guard(wiphy), and IN_DRIVER is set/cleared\nunder RTNL and wiphy paths in drv_add_interface() and\ndrv_remove_interface() in driver-ops.c, so the check is race-free\nagainst driver add/remove. Returning -ENETDOWN is the same error other\nnot-running paths use and does not introduce new locking.\n\n[also add second syzbot report]","modified":"2026-10-15T02:47:42.599606893Z","published":"2026-10-14T13:27:41.192Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98406.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0d1700394e9f5d0bd9bebad8d5a50edf983f52fd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4095b66acae9893dd13deb39a4331651cb2f822b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/432c8532d5ccc2af77da43ed6ef1c80495a4efe8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4ba86c44b2fcb1c3175caa2456b6d58f483446ab"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7978dda63d2b109ea9c3f7a096cd1aac6542cd54"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c2cd9c44777cf97be3e35c10b7c2d8f59ebb9306"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c4ee5685af444024e6222ce29f6ed36adc44ffc3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/da2ca406f45a6e21760243152ed8d2e8e72915c2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98406.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98406"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"554a43d5e77e8256aa9685ffd19ad555e6f77979"},{"fixed":"4ba86c44b2fcb1c3175caa2456b6d58f483446ab"},{"fixed":"4095b66acae9893dd13deb39a4331651cb2f822b"},{"fixed":"c2cd9c44777cf97be3e35c10b7c2d8f59ebb9306"},{"fixed":"0d1700394e9f5d0bd9bebad8d5a50edf983f52fd"},{"fixed":"7978dda63d2b109ea9c3f7a096cd1aac6542cd54"},{"fixed":"432c8532d5ccc2af77da43ed6ef1c80495a4efe8"},{"fixed":"c4ee5685af444024e6222ce29f6ed36adc44ffc3"},{"fixed":"da2ca406f45a6e21760243152ed8d2e8e72915c2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98406.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.5.0"},{"fixed":"5.10.271"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.222"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.54"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98406.json"}}],"schema_version":"1.9.0"}