{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64430", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.787Z", "datePublished": "2026-07-25T08:51:06.612Z", "dateUpdated": "2026-08-17T04:55:30.939Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:55:30.939Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - Routed traffic over the standard NTB Netdev interface causes the peer host to ring the victim's PCIe MSI/MSI-X doorbell, so an unauthenticated remote sender can reach the vulnerable interrupt handler.\nAC:L - Every delivered doorbell enters the sleep-capable MSI lookup, and the attacker can repeatedly or concurrently trigger multiple allocated vectors to drive mutex contention.\nPR:N - NTB Netdev traffic and peer doorbells have no victim-side authentication or capability check, so an unauthenticated network sender needs no privileges.\nUI:N - Once the NTB link is deployed, receiving traffic automatically invokes the hardirq handler without victim user action.\nS:U - The resulting failure affects the vulnerable host kernel itself and does not cross a VM, IOMMU, or other security-authority boundary.\nC:N - The bug performs no out-of-bounds access or disclosure and provides no kernel-memory read primitive.\nI:N - The defect is an illegal sleep and mutex wait in hardirq context, with no memory corruption, arbitrary write, or data-modification primitive.\nA:H - Mutex contention in hardirq context can cause scheduling-while-atomic failures, deadlock or hang, and a kernel panic on hardened panic-on-warning systems." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/ntb/hw/epf/ntb_hw_epf.c" ], "versions": [ { "version": "812ce2f8d14ea791edd88c36ebcc9017bf4c88cb", "lessThan": "33bba331a4a5fee8b6026fe72eca13cceeec1b7b", "status": "affected", "versionType": "git" }, { "version": "812ce2f8d14ea791edd88c36ebcc9017bf4c88cb", "lessThan": "aff271b12a1eb8c8b3da19223ae1a6abe1e8168b", "status": "affected", "versionType": "git" }, { "version": "812ce2f8d14ea791edd88c36ebcc9017bf4c88cb", "lessThan": "1dba8444ac0100133d72374634f6d7451fff1ccc", "status": "affected", "versionType": "git" }, { "version": "812ce2f8d14ea791edd88c36ebcc9017bf4c88cb", "lessThan": "174a97f21bf9c54fa37ec0f321692e862ea130a3", "status": "affected", "versionType": "git" }, { "version": "812ce2f8d14ea791edd88c36ebcc9017bf4c88cb", "lessThan": "f71e8d9875069fa73e335f63f02ec6e52e3aaa51", "status": "affected", "versionType": "git" }, { "version": "812ce2f8d14ea791edd88c36ebcc9017bf4c88cb", "lessThan": "6350df503897d57c5634f71b0767d48c3b837583", "status": "affected", "versionType": "git" }, { "version": "812ce2f8d14ea791edd88c36ebcc9017bf4c88cb", "lessThan": "4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/ntb/hw/epf/ntb_hw_epf.c" ], "versions": [ { "version": "5.12", "status": "affected" }, { "version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.12.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/33bba331a4a5fee8b6026fe72eca13cceeec1b7b" }, { "url": "https://git.kernel.org/stable/c/aff271b12a1eb8c8b3da19223ae1a6abe1e8168b" }, { "url": "https://git.kernel.org/stable/c/1dba8444ac0100133d72374634f6d7451fff1ccc" }, { "url": "https://git.kernel.org/stable/c/174a97f21bf9c54fa37ec0f321692e862ea130a3" }, { "url": "https://git.kernel.org/stable/c/f71e8d9875069fa73e335f63f02ec6e52e3aaa51" }, { "url": "https://git.kernel.org/stable/c/6350df503897d57c5634f71b0767d48c3b837583" }, { "url": "https://git.kernel.org/stable/c/4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f" } ], "title": "NTB: epf: Avoid calling pci_irq_vector() from hardirq context", "x_generator": { "engine": "bippy-1.2.0" } } } }