CVE-2026-98707wifi: mac80211: shut down RX BA session timer on teardown

Official description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: shut down RX BA session timer on teardown Tearing down an RX BA session can leave the session timer queued on a freed tid_rx. Later timer-wheel processing and the timer callback itself then run against freed memory. An RX BAR handler can dereference tid_rx under RCU before teardown unpublishes it and stay in its read-side critical section while teardown deletes the session timer. The stale handler can then rearm the timer after timer_delete_sync() returns and before the RCU callback frees tid_rx. Use timer_shutdown_sync() so rearm attempts become ineffective once teardown starts. Keep reorder_timer unchanged: teardown marks the session removed under reorder_lock and its release path checks that state before rearming. session_timer has no equivalent guard because ieee80211_rx_h_ctrl() rearms it before taking reorder_lock.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/225c67a0bea0bd42f568f4842e747bb7f4bafebb
• https://git.kernel.org/stable/c/18cf74311f3f0bc77384549d270c489f64c6510a
• https://git.kernel.org/stable/c/d0da6ab1fc53a68025929baf0947519c6c1684dc
• https://git.kernel.org/stable/c/7bb2a5bd4f07192fca35644fab7d49a17bfbc861
• https://git.kernel.org/stable/c/481f9230284c27052b59c587069f232c5d84779e
• https://git.kernel.org/stable/c/09b7d5e4f88504e62ddf4ff31ebeebb3b87578ba
• https://git.kernel.org/stable/c/e588e83e5c7a0f6d7a77dbbb58927c8c8cfd598e