CVE-2026-64430 (GCVE-0-2026-64430)
Vulnerability from cvelistv5
Published
2026-07-25 08:51
Modified
2026-08-17 04:55
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb
Version: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb
Version: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb
Version: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb
Version: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb
Version: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb
Version: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/ntb/hw/epf/ntb_hw_epf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "33bba331a4a5fee8b6026fe72eca13cceeec1b7b",
              "status": "affected",
              "version": "812ce2f8d14ea791edd88c36ebcc9017bf4c88cb",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "812ce2f8d14ea791edd88c36ebcc9017bf4c88cb",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "812ce2f8d14ea791edd88c36ebcc9017bf4c88cb",
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            },
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              "status": "affected",
              "version": "812ce2f8d14ea791edd88c36ebcc9017bf4c88cb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/ntb/hw/epf/ntb_hw_epf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Routed traffic over the standard NTB Netdev interface causes the peer host to ring the victim\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:55:30.939Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64430",
    "datePublished": "2026-07-25T08:51:06.612Z",
    "dateReserved": "2026-07-19T15:36:31.787Z",
    "dateUpdated": "2026-08-17T04:55:30.939Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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