{"id":"DEBIAN-CVE-2026-46031","details":"In the Linux kernel, the following vulnerability has been resolved:  net: ks8851: Reinstate disabling of BHs around IRQ handler  If the driver executes ks8851_irq() AND a TX packet has been sent, then the driver enables TX queue via netif_wake_queue() which schedules TX softirq to queue packets for this device.  If CONFIG_PREEMPT_RT=y is set AND a packet has also been received by the MAC, then ks8851_rx_pkts() calls netdev_alloc_skb_ip_align() to allocate SKBs for the received packets. If netdev_alloc_skb_ip_align() is called with BH enabled, then local_bh_enable() at the end of netdev_alloc_skb_ip_align() will trigger the pending softirq processing, which may ultimately call the .xmit callback ks8851_start_xmit_par(). The ks8851_start_xmit_par() will try to lock struct ks8851_net_par .lock spinlock, which is already locked by ks8851_irq() from which ks8851_start_xmit_par() was called. This leads to a deadlock, which is reported by the kernel, including a trace listed below.  If CONFIG_PREEMPT_RT is not set, then since commit 0913ec336a6c0 (\"net: ks8851: Fix deadlock with the SPI chip variant\") the deadlock can also be triggered without received packet in the RX FIFO. The pending softirqs will be processed on return from spin_unlock_bh(&ks-\u003estatelock) in ks8851_irq(), which triggers the deadlock as well.  Fix the problem by disabling BH around critical sections, including the IRQ handler, thus preventing the net_tx_action() softirq from triggering during these critical sections. The net_tx_action() softirq is triggered once BH are re-enabled and at the end of the IRQ handler, once all the other IRQ handler actions have been completed.   __schedule from schedule_rtlock+0x1c/0x34  schedule_rtlock from rtlock_slowlock_locked+0x548/0x904  rtlock_slowlock_locked from rt_spin_lock+0x60/0x9c  rt_spin_lock from ks8851_start_xmit_par+0x74/0x1a8  ks8851_start_xmit_par from netdev_start_xmit+0x20/0x44  netdev_start_xmit from dev_hard_start_xmit+0xd0/0x188  dev_hard_start_xmit from sch_direct_xmit+0xb8/0x25c  sch_direct_xmit from __qdisc_run+0x1f8/0x4ec  __qdisc_run from qdisc_run+0x1c/0x28  qdisc_run from net_tx_action+0x1f0/0x268  net_tx_action from handle_softirqs+0x1a4/0x270  handle_softirqs from __local_bh_enable_ip+0xcc/0xe0  __local_bh_enable_ip from __alloc_skb+0xd8/0x128  __alloc_skb from __netdev_alloc_skb+0x3c/0x19c  __netdev_alloc_skb from ks8851_irq+0x388/0x4d4  ks8851_irq from irq_thread_fn+0x24/0x64  irq_thread_fn from irq_thread+0x178/0x28c  irq_thread from kthread+0x12c/0x138  kthread from ret_from_fork+0x14/0x28","modified":"2026-09-14T17:03:42.309139875Z","published":"2026-05-27T14:17:22.057Z","upstream":["CVE-2026-46031"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-46031"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.176-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","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","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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