{"id":"CVE-2026-64430","summary":"NTB: epf: Avoid calling pci_irq_vector() from hardirq context","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nNTB: epf: Avoid calling pci_irq_vector() from hardirq context\n\nntb_epf_vec_isr() calls pci_irq_vector() in hardirq context to derive\nthe vector number. pci_irq_vector() calls msi_get_virq() that takes a\nmutex and can therefore trigger \"scheduling while atomic\" splats:\n\n  BUG: scheduling while atomic: kworker/u33:0/55/0x00010001\n  ...\n  Call trace:\n   ...\n   schedule+0x38/0x110\n   schedule_preempt_disabled+0x28/0x50\n   __mutex_lock.constprop.0+0x848/0x908\n   __mutex_lock_slowpath+0x18/0x30\n   mutex_lock+0x4c/0x60\n   msi_domain_get_virq+0xe8/0x138\n   pci_irq_vector+0x2c/0x60\n   ntb_epf_vec_isr+0x28/0x120 [ntb_hw_epf]\n   __handle_irq_event_percpu+0x70/0x3a8\n   handle_irq_event+0x48/0x100\n   handle_edge_irq+0x100/0x1c8\n   ...\n\nCache the Linux IRQ number for vector 0 when vectors are allocated and\nuse it as a base in the ISR. Running the ISR in a threaded IRQ handler\nwould also avoid the problem, but that would be unnecessary here.","modified":"2026-09-05T03:31:02.106839674Z","published":"2026-07-25T08:51:06.612Z","related":["openSUSE-SU-2026:11476-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64430.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/174a97f21bf9c54fa37ec0f321692e862ea130a3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1dba8444ac0100133d72374634f6d7451fff1ccc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/33bba331a4a5fee8b6026fe72eca13cceeec1b7b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6350df503897d57c5634f71b0767d48c3b837583"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aff271b12a1eb8c8b3da19223ae1a6abe1e8168b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f71e8d9875069fa73e335f63f02ec6e52e3aaa51"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64430.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64430"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"812ce2f8d14ea791edd88c36ebcc9017bf4c88cb"},{"fixed":"33bba331a4a5fee8b6026fe72eca13cceeec1b7b"},{"fixed":"aff271b12a1eb8c8b3da19223ae1a6abe1e8168b"},{"fixed":"1dba8444ac0100133d72374634f6d7451fff1ccc"},{"fixed":"174a97f21bf9c54fa37ec0f321692e862ea130a3"},{"fixed":"f71e8d9875069fa73e335f63f02ec6e52e3aaa51"},{"fixed":"6350df503897d57c5634f71b0767d48c3b837583"},{"fixed":"4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64430.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.12.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64430.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}