Vulnerability-Lookup

GHSA-XRJ6-M35P-FMRW

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:

LoongArch: KVM: Validate irqchip index in irqfd routing

Sashiko reported that the irqchip index is not validated for LoongArch. Add validation and reject out-of-range irqchip indexes to avoid indexing past the routing table's chip array.

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-2026-72295"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:02Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: KVM: Validate irqchip index in irqfd routing\n\nSashiko reported that the irqchip index is not validated for LoongArch.\nAdd validation and reject out-of-range irqchip indexes to avoid indexing\npast the routing table\u0027s chip array.",
  "id": "GHSA-xrj6-m35p-fmrw",
  "modified": "2026-08-17T06:33:22Z",
  "published": "2026-08-15T06:32:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72295"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/199b570d7fca1aa70e596f10a6276997becffb6d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3474037904c20ff915e3ebab0ab5c1e41bbe549e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8b3e188d19e4ffe916780aeb7ddad9d6457b8bcc"
    }
  ],
  "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-2026-72295 (GCVE-0-2026-72295)

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

Title

LoongArch: KVM: Validate irqchip index in irqfd routing

Summary

In the Linux kernel, the following vulnerability has been resolved: LoongArch: KVM: Validate irqchip index in irqfd routing Sashiko reported that the irqchip index is not validated for LoongArch. Add validation and reject out-of-range irqchip indexes to avoid indexing past the routing table's chip array.

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

References

3 references

URL	Tags
https://git.kernel.org/stable/c/199b570d7fca1aa70…
https://git.kernel.org/stable/c/8b3e188d19e4ffe91…
https://git.kernel.org/stable/c/3474037904c20ff91…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1928254c5ccb7bdffd7f0334e1ce250e9ce4de94 , < 199b570d7fca1aa70e596f10a6276997becffb6d (git) Affected: 1928254c5ccb7bdffd7f0334e1ce250e9ce4de94 , < 8b3e188d19e4ffe916780aeb7ddad9d6457b8bcc (git) Affected: 1928254c5ccb7bdffd7f0334e1ce250e9ce4de94 , < 3474037904c20ff915e3ebab0ab5c1e41bbe549e (git)
Linux	Linux	Affected: 6.13 Unaffected: 0 , < 6.13 (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/loongarch/kvm/irqfd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "199b570d7fca1aa70e596f10a6276997becffb6d",
              "status": "affected",
              "version": "1928254c5ccb7bdffd7f0334e1ce250e9ce4de94",
              "versionType": "git"
            },
            {
              "lessThan": "8b3e188d19e4ffe916780aeb7ddad9d6457b8bcc",
              "status": "affected",
              "version": "1928254c5ccb7bdffd7f0334e1ce250e9ce4de94",
              "versionType": "git"
            },
            {
              "lessThan": "3474037904c20ff915e3ebab0ab5c1e41bbe549e",
              "status": "affected",
              "version": "1928254c5ccb7bdffd7f0334e1ce250e9ce4de94",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/kvm/irqfd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "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": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: KVM: Validate irqchip index in irqfd routing\n\nSashiko reported that the irqchip index is not validated for LoongArch.\nAdd validation and reject out-of-range irqchip indexes to avoid indexing\npast the routing table\u0027s chip array."
        }
      ],
      "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 out-of-bounds write is reached only via local KVM ioctls on /dev/kvm (KVM_CREATE_VM \u2192 KVM_SET_GSI_ROUTING with KVM_IRQ_ROUTING_IRQCHIP); no network, Bluetooth, or physical device path reaches kvm_set_routing_entry().\nAC:L - One KVM_SET_GSI_ROUTING call with irqchip\u003e=KVM_NR_IRQCHIPS (valid pin/gsi) deterministically executes rt-\u003echip[irqchip][pin]=gsi past the chip[] boundary; the attacker fully controls irqchip, pin, and gsi with no race or uncontrollable layout.\nPR:L - Exploitation requires only opening /dev/kvm and holding a VM fd (kvm group membership or CAP_SYS_ADMIN obtainable in a user namespace), matching unprivileged cloud tenants or QEMU service accounts\u2014not init-namespace root.\nUI:N - No victim interaction is needed beyond the attacker\u0027s own KVM setup; a single malicious KVM_SET_GSI_ROUTING ioctl on a VM they control triggers the corruption.\nS:C - A KVM VM operator corrupts host kernel heap memory in the per-VM irq routing table from the KVM userspace interface, crossing the VM-to-host virtualization boundary rather than confining impact to the attacker\u0027s VM scope.\nC:H - Unvalidated irqchip indexes cause out-of-bounds writes past chip[] into nr_rt_entries and map[] hlist metadata in a kmalloc\u0027d routing table; per kernel guidance such heap corruption is leverageable for host kernel memory disclosure.\nI:H - The attacker controls both the OOB index (irqchip,pin) and written value (gsi), yielding targeted corruption of routing-table pointers/state that can be steered toward host privilege escalation or code execution.\nA:H - Corrupting nr_rt_entries or map[] entries breaks subsequent irqfd/GSI routing lookups and irq injection, causing host kernel oops/panic or persistent VM/host denial of service on LoongArch KVM hosts."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:42:28.074Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/199b570d7fca1aa70e596f10a6276997becffb6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b3e188d19e4ffe916780aeb7ddad9d6457b8bcc"
        },
        {
          "url": "https://git.kernel.org/stable/c/3474037904c20ff915e3ebab0ab5c1e41bbe549e"
        }
      ],
      "title": "LoongArch: KVM: Validate irqchip index in irqfd routing",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72295",
    "datePublished": "2026-08-15T05:55:16.590Z",
    "dateReserved": "2026-08-09T03:40:39.917Z",
    "dateUpdated": "2026-08-17T05:42:28.074Z",
    "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.

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.
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.

Action not permitted

GHSA-XRJ6-M35P-FMRW

CVE-2026-72295 (GCVE-0-2026-72295)

Tags

Sightings

Nomenclature