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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-08-17 04:55
VLAI
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
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
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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 , ≤ * (original_commit_for_fix)
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          }
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        "id": "CVE-2026-64430",
        "lastModified": "2026-09-03T18:30:19.423",
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                "confidentialityImpact": "NONE",
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                "privilegesRequired": "NONE",
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        "published": "2026-07-25T10:17:27.203",
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              "Patch"
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            "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"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-29T14:28:01+00:00",
      "cve": "CVE-2026-64430",
      "id": "CVE-2026-64430",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NTB: epf: Avoid calling pci_irq_vector() from hardirq context",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64430.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:48:59Z",
      "cve": "CVE-2026-64430",
      "id": "CVE-2026-64430",
      "initial_release_date": "2026-07-25T15:59:29Z",
      "product_status:known_affected": "262",
      "product_status:known_not_affected": "114",
      "product_status:recommended": "4",
      "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": "7"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.