Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且供應商未提供可用的修補程式。

  - 已解決 Linux 核心中的下列弱點：wifi: mac80211: fix tid_tx use-after-free on BA session stop ieee80211_stop_tx_ba_cb() hands tid_tx to kfree_rcu() through ieee80211_remove_tid_tx(), and then reads tid_tx->ndp after dropping sta->lock:
    ieee80211_remove_tid_tx(sta, tid); /* kfree_rcu(tid_tx, rcu_head) */ ... spin_unlock_bh(&sta->lock); if (start_txq) ieee80211_agg_start_txq(sta, tid, false); if (send_delba) ieee80211_send_delba(..., tid_tx->ndp); That read is not covered by an RCU read-side critical section, and it runs in preemptible process context: both callers hold the wiphy mutex, reaching it either from the ieee80211_ba_session_work() wiphy work or from ieee80211_sta_tear_down_BA_sessions() during station teardown. Softirqs can run in that window too, both from the local_bh_enable() that ends ieee80211_agg_start_txq() and from any interrupt exit, so the RCU callback can free tid_tx before the read. Driving the function from a test module with the grace period forced into that window, KASAN reports the read, and the free arrives on the ordinary RCU softirq path: BUG: KASAN: slab-use-after-free in ieee80211_stop_tx_ba_cb+0x3cd/0x400 Read of size 1 at addr ffff888002b9f52e by task kworker/0:1/10 [...] Freed by task 57: __kasan_slab_free+0x47/0x70 __rcu_free_sheaf_prepare+0x70/0x250 rcu_free_sheaf_nobarn+0x18/0x40 rcu_core+0x426/0x1310 handle_softirqs+0x144/0x590
    __irq_exit_rcu+0xea/0x150 irq_exit_rcu+0x9/0x20 sysvec_apic_timer_interrupt+0x6b/0x80 asm_sysvec_apic_timer_interrupt+0x1a/0x20 send_delba is only set when tx_stop is set, which happens for AGG_STOP_LOCAL_REQUEST alone, so this is reached on local teardown - session idle timeout, PTK rekey, suspend, HW reconfig - and not from a peer's DELBA. Read ndp into a local before the session is freed, while sta->lock is still held. tid_tx->ndp has a single writer, in ieee80211_tx_ba_session_handle_start(), which cannot run concurrently here: both paths are serialised by the wiphy mutex, and the session is already marked HT_AGG_STATE_STOPPING at this point. tid_tx->ndp is also the only tid_tx dereference left after ieee80211_remove_tid_tx() in this function. [move/change the comment a bit to be more general not just on ndp, initialize ndp directly] (CVE-2026-74489)

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偵測

Linux Distros 未修補弱點：CVE-2026-74489

high Nessus Plugin ID 335880

版本 1.6

版本 1.5

版本 1.4

版本 1.2

版本 1.1

版本 1.6 Aug 21, 2026, 11:26 PM CVSS metrics ("CVSSv2 score" set to 8.3) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:A/AC:L/Au:N/C:C/I:C/A:C") CVSSv2 severity (based on CVE-2026-74489, severity increased from "Medium" to "High") Plugin Feed: 202608212326
版本 1.5 Aug 21, 2026, 7:41 AM CVSS metrics ("CVSSv2 score" set to 5.6) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:C") CVSSv2 severity (based on CVE-2026-74489, severity increased from "Low" to "Medium") Detection (updated detection logic) Plugin metadata Plugin Feed: 202608210741
版本 1.4 Aug 19, 2026, 6:09 AM CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:U/RL:U/RC:C") CVSSv2 severity (based on CVE-2026-74489, severity decreased from "High" to "Low") Detection (updated detection logic) Plugin metadata Plugin Feed: 202608190609
版本 1.2 Aug 16, 2026, 2:04 PM Detection (Plugin has been deprecated) Plugin Feed: 202608161404
版本 1.1 Aug 15, 2026, 10:21 PM New Plugin Feed: 202608152221