CVE-2026-64430

{"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"}}}}

{}

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Running the ISR in a threaded IRQ handler\nwould also avoid the problem, but that would be unnecessary here."}], "id": "CVE-2026-64430", "lastModified": "2026-09-03T18:30:19.423", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-25T10:17:27.203", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/174a97f21bf9c54fa37ec0f321692e862ea130a3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1dba8444ac0100133d72374634f6d7451fff1ccc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/33bba331a4a5fee8b6026fe72eca13cceeec1b7b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6350df503897d57c5634f71b0767d48c3b837583"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aff271b12a1eb8c8b3da19223ae1a6abe1e8168b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f71e8d9875069fa73e335f63f02ec6e52e3aaa51"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: NTB: epf: Avoid calling pci_irq_vector() from hardirq context", "id": "2507173", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507173"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-364", "details": ["A flaw was found in the Linux kernel's Non-Transparent Bridge (NTB) Endpoint Function (EPF) component. During critical interrupt processing, the system attempts to acquire a lock, which is an operation not permitted in this context. This improper handling can lead to a system crash, resulting in a denial of service for the affected system."], "name": "CVE-2026-64430", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64430\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64430\nhttps://lore.kernel.org/linux-cve-announce/2026072536-CVE-2026-64430-3346@gregkh/T"], "threat_severity": "Low"}

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