CVE-2026-43448

MEDIUMNVD 4.74.7—
EchelonGraph scoreMEDIUM confidence

Score 4.7 from GitHub Security Advisory published 2026-05-08. NVD baseline CVSS 4.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
4.7
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.7Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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---

CVSS v3
4.7
EG Score
4.7(medium)
EPSS
0.6%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 21, 2026

Advisory Details (6)

Auto-updated Jun 16, 2026
No patch confirmed yet.
generic

nvme-pci: Fix race bug in nvme_poll_irqdisable() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fc71f409b22ca831a9f87a2712eaa09ef2bb4a5e
generic

nvme-pci: Fix race bug in nvme_poll_irqdisable() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e311d84c62eb76e025e11a44155b402e55950b83
generic

nvme-pci: Fix race bug in nvme_poll_irqdisable() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b56c49897bdac5cb49e3495ef421c391628ee9bb
generic

nvme-pci: Fix race bug in nvme_poll_irqdisable() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/843e913cef4e33723663a899727f685a95ab53fe
generic

nvme-pci: Fix race bug in nvme_poll_irqdisable() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/628773eba024d1107cc9ec157a682cbb42ac912a
generic

nvme-pci: Fix race bug in nvme_poll_irqdisable() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/265dbc9bc33c29f60f90be3e0afe1c4067ebb70b

Vendor Advisories for CVE-2026-43448(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-07-13 22:30 UTCEPSS rescore
  2. 2026-07-13 06:13 UTCEPSS rescore
  3. 2026-07-12 05:46 UTCEPSS rescore
  4. 2026-07-11 08:27 UTCEPSS rescore
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  14. 2026-06-28 04:56 UTCEPSS rescore
  15. 2026-06-28 04:26 UTCEG score recompute
  16. 2026-06-28 04:26 UTCGHSA enrichment
  17. 2026-06-27 03:08 UTCEPSS rescore
  18. 2026-06-26 21:21 UTCEG score recompute
  19. 2026-06-26 21:21 UTCGHSA enrichment
  20. 2026-06-25 13:49 UTCEPSS rescore
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  23. 2026-06-23 21:33 UTCEPSS rescore
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  1. 2026-06-21 14:56 UTCEPSS rescore
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  3. 2026-06-21 01:59 UTCEPSS rescore
  4. 2026-06-19 19:25 UTCEPSS rescore
  5. 2026-06-18 17:52 UTCEPSS rescore
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  7. 2026-06-17 17:53 UTCEPSS rescore
  8. 2026-06-16 17:52 UTCEPSS rescore
  9. 2026-06-16 08:08 UTCEG score recompute
  10. 2026-06-16 08:08 UTCGHSA enrichment
  11. 2026-06-15 17:49 UTCEPSS rescore
  12. 2026-06-15 02:36 UTCEG score recompute
  13. 2026-06-15 02:36 UTCGHSA enrichment
  14. 2026-06-14 02:35 UTCEG score recompute
  15. 2026-06-14 02:35 UTCGHSA enrichment
  16. 2026-06-13 23:00 UTCEPSS rescore
  17. 2026-06-12 23:12 UTCEPSS rescore
  18. 2026-06-12 23:12 UTCEPSS rescore
  19. 2026-06-12 08:17 UTCEG score recompute
  20. 2026-06-12 08:16 UTCGHSA enrichment
  21. 2026-06-11 14:00 UTCEPSS rescore
  22. 2026-06-11 08:15 UTCEG score recompute
  23. 2026-06-11 08:15 UTCGHSA enrichment
  24. 2026-06-10 22:18 UTCEPSS rescore
  25. 2026-06-10 13:22 UTCEPSS rescore
  26. 2026-06-10 13:22 UTCEPSS rescore
  27. 2026-06-10 07:59 UTCEG score recompute
  28. 2026-06-10 07:59 UTCGHSA enrichment
  29. 2026-06-09 07:51 UTCEG score recompute
  30. 2026-06-09 07:51 UTCGHSA enrichment
  31. 2026-06-08 14:17 UTCEPSS rescore
  32. 2026-06-08 14:17 UTCEPSS rescore
  33. 2026-06-08 07:48 UTCEG score recompute
  34. 2026-06-08 07:48 UTCGHSA enrichment
  35. 2026-06-07 15:25 UTCEPSS rescore
  36. 2026-06-07 15:25 UTCEPSS rescore
  37. 2026-06-07 07:48 UTCEG score recompute
  38. 2026-06-07 07:48 UTCGHSA enrichment
  39. 2026-06-06 13:47 UTCEPSS rescore
  40. 2026-06-06 13:47 UTCEPSS rescore
  41. 2026-06-06 07:48 UTCEG score recompute
  42. 2026-06-06 07:48 UTCGHSA enrichment
  43. 2026-06-05 22:47 UTCEPSS rescore
  44. 2026-06-05 07:47 UTCEG score recompute
  45. 2026-06-05 07:47 UTCGHSA enrichment
  46. 2026-06-05 06:10 UTCEPSS rescore
  47. 2026-06-05 06:10 UTCEPSS rescore
  48. 2026-06-04 13:12 UTCEPSS rescore
  49. 2026-06-04 13:12 UTCEPSS rescore
  50. 2026-06-04 07:46 UTCEG score recompute
  51. 2026-06-04 07:46 UTCGHSA enrichment
  52. 2026-06-03 07:45 UTCEG score recompute
  53. 2026-06-03 07:45 UTCGHSA enrichment
  54. 2026-06-02 20:13 UTCEPSS rescore
  55. 2026-06-02 07:44 UTCEG score recompute
  56. 2026-06-02 07:44 UTCGHSA enrichment
  57. 2026-06-01 13:52 UTCEPSS rescore
  58. 2026-06-01 13:52 UTCEPSS rescore
  59. 2026-06-01 07:43 UTCEG score recompute▲ 4.70
  60. 2026-06-01 07:43 UTCGHSA enrichment
  61. 2026-05-31 22:30 UTCEPSS rescore
  62. 2026-05-31 22:30 UTCEPSS rescore
  63. 2026-05-31 00:16 UTCEPSS rescore
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  65. 2026-05-29 13:44 UTCEPSS rescore
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  67. 2026-05-28 13:44 UTCEPSS rescore
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  69. 2026-05-27 13:40 UTCEPSS rescore
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  71. 2026-05-26 13:44 UTCEPSS rescore
  72. 2026-05-26 07:18 UTCEPSS rescore
  73. 2026-05-21 22:43 UTCEPSS rescore
  74. 2026-05-20 22:38 UTCEPSS rescore
  75. 2026-05-20 13:36 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-43448?
CVE-2026-43448 is a medium vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: nvme-pci: Fix race bug in nvmepollirqdisable() In the following scenario, pdev can be disabled between (1) and (3) by (2). This sets pdev->msixenabled = 0. Then, pciirq_vector() will return MSI-X IRQ(>15) for (1) whereas return…
When was CVE-2026-43448 disclosed?
CVE-2026-43448 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43448 actively exploited?
CVE-2026-43448 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43448?
CVE-2026-43448 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2026-43448?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43448, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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