Vulnerability-Lookup

CVE-2026-64430 (GCVE-0-2026-64430)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

Title

NTB: epf: Avoid calling pci_irq_vector() from hardirq context

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.

Severity

No CVSS data available.

Assigner

Linux

References

7 references

URL	Tags
https://git.kernel.org/stable/c/33bba331a4a5fee8b…
https://git.kernel.org/stable/c/aff271b12a1eb8c8b…
https://git.kernel.org/stable/c/1dba8444ac0100133…
https://git.kernel.org/stable/c/174a97f21bf9c54fa…
https://git.kernel.org/stable/c/f71e8d9875069fa73…
https://git.kernel.org/stable/c/6350df503897d57c5…
https://git.kernel.org/stable/c/4dcddc1c794d1c65e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb , < 33bba331a4a5fee8b6026fe72eca13cceeec1b7b (git) Affected: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb , < aff271b12a1eb8c8b3da19223ae1a6abe1e8168b (git) Affected: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb , < 1dba8444ac0100133d72374634f6d7451fff1ccc (git) Affected: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb , < 174a97f21bf9c54fa37ec0f321692e862ea130a3 (git) Affected: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb , < f71e8d9875069fa73e335f63f02ec6e52e3aaa51 (git) Affected: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb , < 6350df503897d57c5634f71b0767d48c3b837583 (git) Affected: 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb , < 4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f (git)
Linux	Linux	Affected: 5.12 Unaffected: 0 , < 5.12 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
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          "programFiles": [
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              "versionType": "semver"
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      "cpeApplicability": [
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:51:06.612Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
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        },
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        {
          "url": "https://git.kernel.org/stable/c/4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f"
        }
      ],
      "title": "NTB: epf: Avoid calling pci_irq_vector() from hardirq context",
      "x_generator": {
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      }
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64430",
    "datePublished": "2026-07-25T08:51:06.612Z",
    "dateReserved": "2026-07-19T15:36:31.787Z",
    "dateUpdated": "2026-07-25T08:51:06.612Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-07-26",
      "epss": "0.00173",
      "percentile": "0.06933"
    },
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:59:29Z",
      "cve": "CVE-2026-64430",
      "id": "CVE-2026-64430",
      "initial_release_date": "2026-07-25T15:59:29Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64430",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64430.json",
      "version": "2"
    }
  }
}

GHSA-WWC2-FVCH-VWHH

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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.

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64430"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:27Z",
    "severity": null
  },
  "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.",
  "id": "GHSA-wwc2-fvch-vwhh",
  "modified": "2026-07-25T12:31:35Z",
  "published": "2026-07-25T12:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64430"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64430 (GCVE-0-2026-64430)

GHSA-WWC2-FVCH-VWHH

Tags

Sightings

Nomenclature