CVE-2026-68198
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk19th percentile - higher than 19% of all known CVEs
Summary
In the Linux kernel, in the wifi ath6kl driver, there is a use-after-free issue in the aggr_reset_state() function. The function uses timer_delete() (non-synchronous) for the aggregation timer before proceeding to delete TID state and before the structure is freed by callers like aggr_module_destroy(). If the timer callback is executing at that time, it may access freed memory.
Risk Assessment
This can lead to use-after-free, potentially resulting in system crashes or potential execution of malicious code by a local user or attacker with access to the wifi interface.
Recommendation
Apply the Linux kernel patch that uses timer_delete_sync() instead of timer_delete() to ensure any running timer callback has completed before returning.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: wifi: ath6kl: fix use-after-free in aggr_reset_state() The aggr_reset_state() function uses timer_delete() (non-synchronous) for the aggregation timer before proceeding to delete TID state and before the structure is freed by callers like aggr_module_destroy(). If the timer callback (aggr_timeout) is executing when aggr_reset_state() is called, the callback will continue to access aggr_conn fields like rx_tid[] and stat[] which may be freed immediately after by kfree(aggr_info->aggr_conn) in aggr_module_destroy(). Additionally, the timer callback can re-arm itself via mod_timer() while aggr_reset_state() is running, creating a more complex race condition. Use timer_delete_sync() instead to ensure any running timer callback has completed before returning.