{"id":"DEBIAN-CVE-2024-40912","details":"In the Linux kernel, the following vulnerability has been resolved:  wifi: mac80211: Fix deadlock in ieee80211_sta_ps_deliver_wakeup()  The ieee80211_sta_ps_deliver_wakeup() function takes sta-\u003eps_lock to synchronizes with ieee80211_tx_h_unicast_ps_buf() which is called from softirq context. However using only spin_lock() to get sta-\u003eps_lock in ieee80211_sta_ps_deliver_wakeup() does not prevent softirq to execute on this same CPU, to run ieee80211_tx_h_unicast_ps_buf() and try to take this same lock ending in deadlock. Below is an example of rcu stall that arises in such situation.   rcu: INFO: rcu_sched self-detected stall on CPU  rcu:    2-....: (42413413 ticks this GP) idle=b154/1/0x4000000000000000 softirq=1763/1765 fqs=21206996  rcu:    (t=42586894 jiffies g=2057 q=362405 ncpus=4)  CPU: 2 PID: 719 Comm: wpa_supplicant Tainted: G        W          6.4.0-02158-g1b062f552873 #742  Hardware name: RPT (r1) (DT)  pstate: 00000005 (nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)  pc : queued_spin_lock_slowpath+0x58/0x2d0  lr : invoke_tx_handlers_early+0x5b4/0x5c0  sp : ffff00001ef64660  x29: ffff00001ef64660 x28: ffff000009bc1070 x27: ffff000009bc0ad8  x26: ffff000009bc0900 x25: ffff00001ef647a8 x24: 0000000000000000  x23: ffff000009bc0900 x22: ffff000009bc0900 x21: ffff00000ac0e000  x20: ffff00000a279e00 x19: ffff00001ef646e8 x18: 0000000000000000  x17: ffff800016468000 x16: ffff00001ef608c0 x15: 0010533c93f64f80  x14: 0010395c9faa3946 x13: 0000000000000000 x12: 00000000fa83b2da  x11: 000000012edeceea x10: ffff0000010fbe00 x9 : 0000000000895440  x8 : 000000000010533c x7 : ffff00000ad8b740 x6 : ffff00000c350880  x5 : 0000000000000007 x4 : 0000000000000001 x3 : 0000000000000000  x2 : 0000000000000000 x1 : 0000000000000001 x0 : ffff00000ac0e0e8  Call trace:   queued_spin_lock_slowpath+0x58/0x2d0   ieee80211_tx+0x80/0x12c   ieee80211_tx_pending+0x110/0x278   tasklet_action_common.constprop.0+0x10c/0x144   tasklet_action+0x20/0x28   _stext+0x11c/0x284   ____do_softirq+0xc/0x14   call_on_irq_stack+0x24/0x34   do_softirq_own_stack+0x18/0x20   do_softirq+0x74/0x7c   __local_bh_enable_ip+0xa0/0xa4   _ieee80211_wake_txqs+0x3b0/0x4b8   __ieee80211_wake_queue+0x12c/0x168   ieee80211_add_pending_skbs+0xec/0x138   ieee80211_sta_ps_deliver_wakeup+0x2a4/0x480   ieee80211_mps_sta_status_update.part.0+0xd8/0x11c   ieee80211_mps_sta_status_update+0x18/0x24   sta_apply_parameters+0x3bc/0x4c0   ieee80211_change_station+0x1b8/0x2dc   nl80211_set_station+0x444/0x49c   genl_family_rcv_msg_doit.isra.0+0xa4/0xfc   genl_rcv_msg+0x1b0/0x244   netlink_rcv_skb+0x38/0x10c   genl_rcv+0x34/0x48   netlink_unicast+0x254/0x2bc   netlink_sendmsg+0x190/0x3b4   ____sys_sendmsg+0x1e8/0x218   ___sys_sendmsg+0x68/0x8c   __sys_sendmsg+0x44/0x84   __arm64_sys_sendmsg+0x20/0x28   do_el0_svc+0x6c/0xe8   el0_svc+0x14/0x48   el0t_64_sync_handler+0xb0/0xb4   el0t_64_sync+0x14c/0x150  Using spin_lock_bh()/spin_unlock_bh() instead prevents softirq to raise on the same CPU that is holding the lock.","modified":"2026-09-15T09:03:09.496674119Z","published":"2024-07-12T13:15:14.363Z","upstream":["CVE-2024-40912"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-40912"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.99-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-40912.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.9.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-40912.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.9.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-40912.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}