Vulnerability-Lookup

GHSA-WW73-CJ9W-H762

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

In the Linux kernel, the following vulnerability has been resolved:

KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails

Nullify irqfd->producer if updating the IRTE for bypass fails, as leaving a dangling pointer will result in a use-after-free if the irqfd is reachable through KVM's routing, but the producer is freed separately. E.g. for VFIO PCI, the producer is embedded in struct "vfio_pci_irq_ctx" and freed when the vector is disabled, which can happen independent of routing updates.

[sean: drop PPC change, massage changelog]

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72283"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:59Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Nullify irqfd-\u003eproducer if updating IRTE for bypass fails\n\nNullify irqfd-\u003eproducer if updating the IRTE for bypass fails, as leaving a\ndangling pointer will result in a use-after-free if the irqfd is reachable\nthrough KVM\u0027s routing, but the producer is freed separately.  E.g. for VFIO\nPCI, the producer is embedded in struct \"vfio_pci_irq_ctx\" and freed when\nthe vector is disabled, which can happen independent of routing updates.\n\n[sean: drop PPC change, massage changelog]",
  "id": "GHSA-ww73-cj9w-h762",
  "modified": "2026-08-17T06:33:21Z",
  "published": "2026-08-15T06:32:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72283"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1379888cc4230bac647ec24ab83306afbd03e88"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5560b6569cd05ba72c6b33427fbabc6ec46b8cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed446e8aa894883c08892cfee69782fdf8f6c3ca"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72283 (GCVE-0-2026-72283)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:42

Title

KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails Nullify irqfd->producer if updating the IRTE for bypass fails, as leaving a dangling pointer will result in a use-after-free if the irqfd is reachable through KVM's routing, but the producer is freed separately. E.g. for VFIO PCI, the producer is embedded in struct "vfio_pci_irq_ctx" and freed when the vector is disabled, which can happen independent of routing updates. [sean: drop PPC change, massage changelog]

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

3 references

URL	Tags
https://git.kernel.org/stable/c/d1379888cc4230bac…
https://git.kernel.org/stable/c/d5560b6569cd05ba7…
https://git.kernel.org/stable/c/ed446e8aa894883c0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 77e1b8332d1d7aa786f7515e9bd4055def6a1e06 , < d1379888cc4230bac647ec24ab83306afbd03e88 (git) Affected: 77e1b8332d1d7aa786f7515e9bd4055def6a1e06 , < d5560b6569cd05ba72c6b33427fbabc6ec46b8cf (git) Affected: 77e1b8332d1d7aa786f7515e9bd4055def6a1e06 , < ed446e8aa894883c08892cfee69782fdf8f6c3ca (git)
Linux	Linux	Affected: 6.17 Unaffected: 0 , < 6.17 (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/irq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d1379888cc4230bac647ec24ab83306afbd03e88",
              "status": "affected",
              "version": "77e1b8332d1d7aa786f7515e9bd4055def6a1e06",
              "versionType": "git"
            },
            {
              "lessThan": "d5560b6569cd05ba72c6b33427fbabc6ec46b8cf",
              "status": "affected",
              "version": "77e1b8332d1d7aa786f7515e9bd4055def6a1e06",
              "versionType": "git"
            },
            {
              "lessThan": "ed446e8aa894883c08892cfee69782fdf8f6c3ca",
              "status": "affected",
              "version": "77e1b8332d1d7aa786f7515e9bd4055def6a1e06",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/irq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "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": "6.18.40",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Nullify irqfd-\u003eproducer if updating IRTE for bypass fails\n\nNullify irqfd-\u003eproducer if updating the IRTE for bypass fails, as leaving a\ndangling pointer will result in a use-after-free if the irqfd is reachable\nthrough KVM\u0027s routing, but the producer is freed separately.  E.g. for VFIO\nPCI, the producer is embedded in struct \"vfio_pci_irq_ctx\" and freed when\nthe vector is disabled, which can happen independent of routing updates.\n\n[sean: drop PPC change, massage changelog]"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only through local KVM VM ioctls (KVM_IRQFD, KVM_SET_GSI_ROUTING) and VFIO PCI IRQ ioctls that wire an irqfd consumer to a VFIO MSI/MSI-X producer; there is no network, adjacent-radio, or physical-device attack surface.\nAC:L - An attacker who can open the VM and VFIO fds controls both sides of the failure window (provoke kvm_pi_update_irte() to fail during irq_bypass_add_producer, disable the VFIO vector to free vfio_pci_irq_ctx, then change GSI routing) and can retry routing/affinity until the dangling irqfd-\u003eproducer is dereferenced.\nPR:L - Exploitation requires only local access to KVM and VFIO device nodes to issue the relevant ioctls (typical for QEMU/libvirt kvm-group operators or cloud tenants running VMs with PCI passthrough), not full init-namespace root or capabilities obtainable only inside unprivileged user namespaces.\nUI:N - The use-after-free is triggered entirely by the attacker\u0027s own ioctl sequence and subsequent routing updates; no victim login, file open, mount, or other interactive action is required.\nS:C - The dangling producer is used to update IOMMU posted-interrupt IRTEs for VFIO-assigned PCI MSIs, crossing the guest/host device-assignment boundary; corrupting interrupt remapping can compromise the host kernel and enable VM escape rather than staying within the attacker\u0027s VM scope.\nC:H - This is a kernel heap use-after-free on irqfd-\u003eproducer embedded in vfio_pci_irq_ctx; freed-object reuse supplies attacker-influenced host_irq values to irq_set_vcpu_affinity(), enabling arbitrary kernel memory reads and pointer disclosure, not merely a bounded leak.\nI:H - UAF of the VFIO irq producer plus mistaken irq_set_vcpu_affinity()/IRTE reprogramming with a stale or attacker-controlled IRQ number can corrupt host kernel heap metadata and IOMMU interrupt tables, providing a path to arbitrary write and code execution.\nA:H - Dereferencing the freed vfio_pci_irq_ctx from kvm_pi_update_irte() during kvm_irq_routing_update() can immediately BUG/WARN/oops the host kernel; even attempted exploitation of the UAF commonly crashes the host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:42:18.185Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d1379888cc4230bac647ec24ab83306afbd03e88"
        },
        {
          "url": "https://git.kernel.org/stable/c/d5560b6569cd05ba72c6b33427fbabc6ec46b8cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed446e8aa894883c08892cfee69782fdf8f6c3ca"
        }
      ],
      "title": "KVM: x86: Nullify irqfd-\u003eproducer if updating IRTE for bypass fails",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72283",
    "datePublished": "2026-08-15T05:55:06.959Z",
    "dateReserved": "2026-08-09T03:40:39.917Z",
    "dateUpdated": "2026-08-17T05:42:18.185Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-WW73-CJ9W-H762

CVE-2026-72283 (GCVE-0-2026-72283)

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