{"id":"DEBIAN-CVE-2026-43448","details":"In the Linux kernel, the following vulnerability has been resolved:  nvme-pci: Fix race bug in nvme_poll_irqdisable()  In the following scenario, pdev can be disabled between (1) and (3) by (2). This sets pdev-\u003emsix_enabled = 0. Then, pci_irq_vector() will return MSI-X IRQ(\u003e15) for (1) whereas return INTx IRQ(\u003c=15) for (2). This causes IRQ warning because it tries to enable INTx IRQ that has never been disabled before.  To fix this, save IRQ number into a local variable and ensure disable_irq() and enable_irq() operate on the same IRQ number.  Even if pci_free_irq_vectors() frees the IRQ concurrently, disable_irq() and enable_irq() on a stale IRQ number is still valid and safe, and the depth accounting reamins balanced.  task 1: nvme_poll_irqdisable()   disable_irq(pci_irq_vector(pdev, nvmeq-\u003ecq_vector)) ...(1)   enable_irq(pci_irq_vector(pdev, nvmeq-\u003ecq_vector))  ...(3)  task 2: nvme_reset_work()   nvme_dev_disable()     pdev-\u003emsix_enable = 0;  ...(2)  crash log:  ------------[ cut here ]------------ Unbalanced enable for IRQ 10 WARNING: kernel/irq/manage.c:753 at __enable_irq+0x102/0x190 kernel/irq/manage.c:753, CPU#1: kworker/1:0H/26 Modules linked in: CPU: 1 UID: 0 PID: 26 Comm: kworker/1:0H Not tainted 6.19.0-dirty #9 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 Workqueue: kblockd blk_mq_timeout_work RIP: 0010:__enable_irq+0x107/0x190 kernel/irq/manage.c:753 Code: ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 79 48 8d 3d 2e 7a 3f 05 41 8b 74 24 2c \u003c67\u003e 48 0f b9 3a e8 ef b9 21 00 5b 41 5c 5d e9 46 54 66 03 e8 e1 b9 RSP: 0018:ffffc900001bf550 EFLAGS: 00010046 RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffffb20c0e90 RDX: 0000000000000000 RSI: 000000000000000a RDI: ffffffffb74b88f0 RBP: ffffc900001bf560 R08: ffff88800197cf00 R09: 0000000000000001 R10: 0000000000000003 R11: 0000000000000003 R12: ffff8880012a6000 R13: 1ffff92000037eae R14: 000000000000000a R15: 0000000000000293 FS:  0000000000000000(0000) GS:ffff8880b49f7000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555da4a25fa8 CR3: 00000000208e8000 CR4: 00000000000006f0 Call Trace:  \u003cTASK\u003e  enable_irq+0x121/0x1e0 kernel/irq/manage.c:797  nvme_poll_irqdisable+0x162/0x1c0 drivers/nvme/host/pci.c:1494  nvme_timeout+0x965/0x14b0 drivers/nvme/host/pci.c:1744  blk_mq_rq_timed_out block/blk-mq.c:1653 [inline]  blk_mq_handle_expired+0x227/0x2d0 block/blk-mq.c:1721  bt_iter+0x2fc/0x3a0 block/blk-mq-tag.c:292  __sbitmap_for_each_set include/linux/sbitmap.h:269 [inline]  sbitmap_for_each_set include/linux/sbitmap.h:290 [inline]  bt_for_each block/blk-mq-tag.c:324 [inline]  blk_mq_queue_tag_busy_iter+0x969/0x1e80 block/blk-mq-tag.c:536  blk_mq_timeout_work+0x627/0x870 block/blk-mq.c:1763  process_one_work+0x956/0x1aa0 kernel/workqueue.c:3257  process_scheduled_works kernel/workqueue.c:3340 [inline]  worker_thread+0x65c/0xe60 kernel/workqueue.c:3421  kthread+0x41a/0x930 kernel/kthread.c:463  ret_from_fork+0x6f8/0x8c0 arch/x86/kernel/process.c:158  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246  \u003c/TASK\u003e irq event stamp: 74478 hardirqs last  enabled at (74477): [\u003cffffffffb5720a9c\u003e] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last  enabled at (74477): [\u003cffffffffb5720a9c\u003e] _raw_spin_unlock_irq+0x2c/0x60 kernel/locking/spinlock.c:202 hardirqs last disabled at (74478): [\u003cffffffffb57207b5\u003e] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (74478): [\u003cffffffffb57207b5\u003e] _raw_spin_lock_irqsave+0x85/0xa0 kernel/locking/spinlock.c:162 softirqs last  enabled at (74304): [\u003cffffffffb1e9466c\u003e] __do_softirq kernel/softirq.c:656 [inline] softirqs last  enabled at (74304): [\u003cffffffffb1e9466c\u003e] invoke_softirq kernel/softirq.c:496 [inline] softirqs last  enabled at (74304): [\u003cffffffffb1e9466c\u003e] __irq_exit_rcu+0xdc/0x120 ---truncated---","modified":"2026-09-01T16:06:44.006370647Z","published":"2026-05-08T15:16:57.323Z","upstream":["CVE-2026-43448"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-43448"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.170-1"}]}],"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","6.1.27-1","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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