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GHSA-938F-6JJ9-X227

Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-21 18:33
VLAI
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->msix_enabled = 0. Then, pci_irq_vector() will return MSI-X IRQ(>15) for (1) whereas return INTx IRQ(<=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->cq_vector)) ...(1) enable_irq(pci_irq_vector(pdev, nvmeq->cq_vector)) ...(3)

task 2: nvme_reset_work() nvme_dev_disable() pdev->msix_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 <67> 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: 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 irq event stamp: 74478 hardirqs last enabled at (74477): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (74477): [] _raw_spin_unlock_irq+0x2c/0x60 kernel/locking/spinlock.c:202 hardirqs last disabled at (74478): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (74478): [] _raw_spin_lock_irqsave+0x85/0xa0 kernel/locking/spinlock.c:162 softirqs last enabled at (74304): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (74304): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (74304): [] __irq_exit_rcu+0xdc/0x120 ---truncated---

Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43448"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-08T15:16:57Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-pci: Fix race bug in nvme_poll_irqdisable()\n\nIn the following scenario, pdev can be disabled between (1) and (3) by\n(2). This sets pdev-\u003emsix_enabled = 0. Then, pci_irq_vector() will\nreturn MSI-X IRQ(\u003e15) for (1) whereas return INTx IRQ(\u003c=15) for (2).\nThis causes IRQ warning because it tries to enable INTx IRQ that has\nnever been disabled before.\n\nTo fix this, save IRQ number into a local variable and ensure\ndisable_irq() and enable_irq() operate on the same IRQ number.  Even if\npci_free_irq_vectors() frees the IRQ concurrently, disable_irq() and\nenable_irq() on a stale IRQ number is still valid and safe, and the\ndepth accounting reamins balanced.\n\ntask 1:\nnvme_poll_irqdisable()\n  disable_irq(pci_irq_vector(pdev, nvmeq-\u003ecq_vector)) ...(1)\n  enable_irq(pci_irq_vector(pdev, nvmeq-\u003ecq_vector))  ...(3)\n\ntask 2:\nnvme_reset_work()\n  nvme_dev_disable()\n    pdev-\u003emsix_enable = 0;  ...(2)\n\ncrash log:\n\n------------[ cut here ]------------\nUnbalanced enable for IRQ 10\nWARNING: kernel/irq/manage.c:753 at __enable_irq+0x102/0x190 kernel/irq/manage.c:753, CPU#1: kworker/1:0H/26\nModules linked in:\nCPU: 1 UID: 0 PID: 26 Comm: kworker/1:0H Not tainted 6.19.0-dirty #9 PREEMPT(voluntary)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\nWorkqueue: kblockd blk_mq_timeout_work\nRIP: 0010:__enable_irq+0x107/0x190 kernel/irq/manage.c:753\nCode: 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\nRSP: 0018:ffffc900001bf550 EFLAGS: 00010046\nRAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffffb20c0e90\nRDX: 0000000000000000 RSI: 000000000000000a RDI: ffffffffb74b88f0\nRBP: ffffc900001bf560 R08: ffff88800197cf00 R09: 0000000000000001\nR10: 0000000000000003 R11: 0000000000000003 R12: ffff8880012a6000\nR13: 1ffff92000037eae R14: 000000000000000a R15: 0000000000000293\nFS:  0000000000000000(0000) GS:ffff8880b49f7000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000555da4a25fa8 CR3: 00000000208e8000 CR4: 00000000000006f0\nCall Trace:\n \u003cTASK\u003e\n enable_irq+0x121/0x1e0 kernel/irq/manage.c:797\n nvme_poll_irqdisable+0x162/0x1c0 drivers/nvme/host/pci.c:1494\n nvme_timeout+0x965/0x14b0 drivers/nvme/host/pci.c:1744\n blk_mq_rq_timed_out block/blk-mq.c:1653 [inline]\n blk_mq_handle_expired+0x227/0x2d0 block/blk-mq.c:1721\n bt_iter+0x2fc/0x3a0 block/blk-mq-tag.c:292\n __sbitmap_for_each_set include/linux/sbitmap.h:269 [inline]\n sbitmap_for_each_set include/linux/sbitmap.h:290 [inline]\n bt_for_each block/blk-mq-tag.c:324 [inline]\n blk_mq_queue_tag_busy_iter+0x969/0x1e80 block/blk-mq-tag.c:536\n blk_mq_timeout_work+0x627/0x870 block/blk-mq.c:1763\n process_one_work+0x956/0x1aa0 kernel/workqueue.c:3257\n process_scheduled_works kernel/workqueue.c:3340 [inline]\n worker_thread+0x65c/0xe60 kernel/workqueue.c:3421\n kthread+0x41a/0x930 kernel/kthread.c:463\n ret_from_fork+0x6f8/0x8c0 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246\n \u003c/TASK\u003e\nirq event stamp: 74478\nhardirqs last  enabled at (74477): [\u003cffffffffb5720a9c\u003e] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline]\nhardirqs last  enabled at (74477): [\u003cffffffffb5720a9c\u003e] _raw_spin_unlock_irq+0x2c/0x60 kernel/locking/spinlock.c:202\nhardirqs last disabled at (74478): [\u003cffffffffb57207b5\u003e] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]\nhardirqs last disabled at (74478): [\u003cffffffffb57207b5\u003e] _raw_spin_lock_irqsave+0x85/0xa0 kernel/locking/spinlock.c:162\nsoftirqs last  enabled at (74304): [\u003cffffffffb1e9466c\u003e] __do_softirq kernel/softirq.c:656 [inline]\nsoftirqs last  enabled at (74304): [\u003cffffffffb1e9466c\u003e] invoke_softirq kernel/softirq.c:496 [inline]\nsoftirqs last  enabled at (74304): [\u003cffffffffb1e9466c\u003e] __irq_exit_rcu+0xdc/0x120\n---truncated---",
  "id": "GHSA-938f-6jj9-x227",
  "modified": "2026-05-21T18:33:06Z",
  "published": "2026-05-08T15:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43448"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/265dbc9bc33c29f60f90be3e0afe1c4067ebb70b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/628773eba024d1107cc9ec157a682cbb42ac912a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/843e913cef4e33723663a899727f685a95ab53fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b56c49897bdac5cb49e3495ef421c391628ee9bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e311d84c62eb76e025e11a44155b402e55950b83"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc71f409b22ca831a9f87a2712eaa09ef2bb4a5e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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