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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix tid_tx use-after-free on BA session stop\n\nieee80211_stop_tx_ba_cb() hands tid_tx to kfree_rcu() through\nieee80211_remove_tid_tx(), and then reads tid_tx-\u003endp after dropping\nsta-\u003elock:\n\n\tieee80211_remove_tid_tx(sta, tid);\t/* kfree_rcu(tid_tx, rcu_head) */\n\t...\n\tspin_unlock_bh(\u0026sta-\u003elock);\n\n\tif (start_txq)\n\t\tieee80211_agg_start_txq(sta, tid, false);\n\n\tif (send_delba)\n\t\tieee80211_send_delba(..., tid_tx-\u003endp);\n\nThat read is not covered by an RCU read-side critical section, and it runs\nin preemptible process context: both callers hold the wiphy mutex, reaching\nit either from the ieee80211_ba_session_work() wiphy work or from\nieee80211_sta_tear_down_BA_sessions() during station teardown.\nSoftirqs can run in that window too, both from the local_bh_enable() that\nends ieee80211_agg_start_txq() and from any interrupt exit, so the RCU\ncallback can free tid_tx before the read.\n\nDriving the function from a test module with the grace period forced into\nthat window, KASAN reports the read, and the free arrives on the ordinary\nRCU softirq path:\n\n  BUG: KASAN: slab-use-after-free in ieee80211_stop_tx_ba_cb+0x3cd/0x400\n  Read of size 1 at addr ffff888002b9f52e by task kworker/0:1/10\n  [...]\n  Freed by task 57:\n   __kasan_slab_free+0x47/0x70\n   __rcu_free_sheaf_prepare+0x70/0x250\n   rcu_free_sheaf_nobarn+0x18/0x40\n   rcu_core+0x426/0x1310\n   handle_softirqs+0x144/0x590\n   __irq_exit_rcu+0xea/0x150\n   irq_exit_rcu+0x9/0x20\n   sysvec_apic_timer_interrupt+0x6b/0x80\n   asm_sysvec_apic_timer_interrupt+0x1a/0x20\n\nsend_delba is only set when tx_stop is set, which happens for\nAGG_STOP_LOCAL_REQUEST alone, so this is reached on local teardown -\nsession idle timeout, PTK rekey, suspend, HW reconfig - and not from a\npeer\u0027s DELBA.\n\nRead ndp into a local before the session is freed, while sta-\u003elock is still\nheld. tid_tx-\u003endp has a single writer, in\nieee80211_tx_ba_session_handle_start(), which cannot run concurrently here:\nboth paths are serialised by the wiphy mutex, and the session is already\nmarked HT_AGG_STATE_STOPPING at this point. tid_tx-\u003endp is also the only\ntid_tx dereference left after ieee80211_remove_tid_tx() in this function.\n\n[move/change the comment a bit to be more general not just on ndp,\n initialize ndp directly]"
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              "value": "AV:A - The bug is in mac80211 WiFi block-ack teardown; an adjacent 802.11 peer with an active TX BA session can drive AGG_STOP_LOCAL_REQUEST via negotiated session-idle timeouts, PTK rekey, or link conditions that cause local session stop.\nAC:L - This is a slab use-after-free where RCU can free tid_tx between ieee80211_remove_tid_tx() and the post-unlock tid_tx-\u003endp read; the commit reproduced it reliably, and an attacker can repeatedly trigger local BA teardown to hit the race window.\nPR:N - Exploitation requires no Linux user or administrator privileges on the victim, only normal 802.11 association as a WiFi peer to maintain a block-ack session that later undergoes local teardown.\nUI:N - No victim interaction beyond routine WiFi connectivity is needed; session-idle timers, rekey, and driver-initiated local BA stop can fire from background wireless activity without the user performing a specific action.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the host kernel; it does not cross a VM, IOMMU, or sandbox security boundary.\nC:H - Reading tid_tx-\u003endp after kfree_rcu() is a slab use-after-free of a kernel heap object, which can disclose or infer kernel memory contents and support further exploitation primitives.\nI:H - Use-after-free of tid_ampdu_tx enables heap corruption and control of freed object contents, which can be leveraged for arbitrary kernel writes or code execution beyond the single-byte ndp read.\nA:H - The freed-object dereference can cause kernel oops/panic; KASAN reported slab-use-after-free in ieee80211_stop_tx_ba_cb during BA session stop, and UAFs in mac80211 commonly crash the system."
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