CVE-2026-64430NTB: epf: Avoid calling pci_irq_vector() from hardirq context
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: NTB: epf: Avoid calling pci_irq_vector() from hardirq context ntb_epf_vec_isr() calls pci_irq_vector() in hardirq context to derive the vector number. pci_irq_vector() calls msi_get_virq() that takes a mutex and can therefore trigger "scheduling while atomic" splats: BUG: scheduling while atomic: kworker/u33:0/55/0x00010001 ... Call trace: ... schedule+0x38/0x110 schedule_preempt_disabled+0x28/0x50 __mutex_lock.constprop.0+0x848/0x908 __mutex_lock_slowpath+0x18/0x30 mutex_lock+0x4c/0x60 msi_domain_get_virq+0xe8/0x138 pci_irq_vector+0x2c/0x60 ntb_epf_vec_isr+0x28/0x120 [ntb_hw_epf] __handle_irq_event_percpu+0x70/0x3a8 handle_irq_event+0x48/0x100 handle_edge_irq+0x100/0x1c8 ... Cache the Linux IRQ number for vector 0 when vectors are allocated and use it as a base in the ISR. Running the ISR in a threaded IRQ handler would also avoid the problem, but that would be unnecessary here.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb builds before 33bba331a4a5fee8b6026fe72eca13cceeec1b7b; from 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb before aff271b12a1eb8c8b3da19223ae1a6abe1e8168b; 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb builds before 1dba8444ac0100133d72374634f6d7451fff1ccc; 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb builds before 174a97f21bf9c54fa37ec0f321692e862ea130a3; from 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb before f71e8d9875069fa73e335f63f02ec6e52e3aaa51; from 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb before 6350df503897d57c5634f71b0767d48c3b837583; 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb builds before 4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f | CNA record |
linux linux_kernel linux:linux_kernel | from 5.12 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4 | NVD |
References
- https://git.kernel.org/stable/c/33bba331a4a5fee8b6026fe72eca13cceeec1b7bpatch
- https://git.kernel.org/stable/c/aff271b12a1eb8c8b3da19223ae1a6abe1e8168bpatch
- https://git.kernel.org/stable/c/1dba8444ac0100133d72374634f6d7451fff1cccpatch
- https://git.kernel.org/stable/c/174a97f21bf9c54fa37ec0f321692e862ea130a3patch
- https://git.kernel.org/stable/c/f71e8d9875069fa73e335f63f02ec6e52e3aaa51patch
- https://git.kernel.org/stable/c/6350df503897d57c5634f71b0767d48c3b837583patch
- https://git.kernel.org/stable/c/4dcddc1c794d1c65eda68f1f8dd04a0fecc0870fpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.