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CVE-2026-80693

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: idpf: bound interrupt-vector register fill to the allocated array idpf_get_reg_intr_vecs() fills the caller-allocated reg_vals[] array from the VIRTCHNL2_OP_ALLOC_VECTORS reply in adapter->req_vec_chunks, bounding its inner loop only by the per-chunk num_vectors. The array is sized separately: idpf_intr_reg_init() allocates kzalloc_objs(struct idpf_vec_regs, total_vecs) from caps.num_allocated_vectors and only checks the returned count after the fill. The sum of per-chunk num_vectors is never reconciled against total_vecs, so a reply with a small num_allocated_vectors but chunks summing higher writes past the end of reg_vals[]. Impact: a control plane (a PF or hypervisor device model) that returns a VIRTCHNL2_OP_ALLOC_VECTORS reply whose per-chunk num_vectors sum exceeds num_allocated_vectors writes struct idpf_vec_regs entries past the end of the reg_vals kmalloc allocation (KASAN slab-out-of-bounds write). Bound the fill loop to the array capacity passed in by the callers, mirroring the sibling idpf_vport_get_q_reg(). The existing num_regs < num_vecs check then rejects an undersized reply without the out-of-bounds write happening first.

Severity
CRITICAL
CVSS score
9.3 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-28 08:16:54.787000
Last modified
2026-10-21 13:19:58.290000
View original CVE JSON 
{
  "id": "CVE-2026-80693",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-08-28T08:16:54.787",
  "lastModified": "2026-10-21T13:19:58.290",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nidpf: bound interrupt-vector register fill to the allocated array\n\nidpf_get_reg_intr_vecs() fills the caller-allocated reg_vals[] array from\nthe VIRTCHNL2_OP_ALLOC_VECTORS reply in adapter->req_vec_chunks, bounding\nits inner loop only by the per-chunk num_vectors. The array is sized\nseparately: idpf_intr_reg_init() allocates\nkzalloc_objs(struct idpf_vec_regs, total_vecs) from\ncaps.num_allocated_vectors and only checks the returned count after the\nfill. The sum of per-chunk num_vectors is never reconciled against\ntotal_vecs, so a reply with a small num_allocated_vectors but chunks\nsumming higher writes past the end of reg_vals[].\n\nImpact: a control plane (a PF or hypervisor device model) that returns a\nVIRTCHNL2_OP_ALLOC_VECTORS reply whose per-chunk num_vectors sum exceeds\nnum_allocated_vectors writes struct idpf_vec_regs entries past the end of\nthe reg_vals kmalloc allocation (KASAN slab-out-of-bounds write).\n\nBound the fill loop to the array capacity passed in by the callers,\nmirroring the sibling idpf_vport_get_q_reg(). The existing\nnum_regs < num_vecs check then rejects an undersized reply without the\nout-of-bounds write happening first."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/net/ethernet/intel/idpf/idpf_dev.c",
            "drivers/net/ethernet/intel/idpf/idpf_vf_dev.c",
            "drivers/net/ethernet/intel/idpf/idpf_virtchnl.c",
            "drivers/net/ethernet/intel/idpf/idpf_virtchnl.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "d4d5587182664b0c4ab6d3556ce881cb975507c2",
              "lessThan": "a6447b6a9678e701ca4d32789f311067cf528c2d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d4d5587182664b0c4ab6d3556ce881cb975507c2",
              "lessThan": "e299b7d1334ebec4d43a7bb697d10c12df1aaed3",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d4d5587182664b0c4ab6d3556ce881cb975507c2",
              "lessThan": "41bb8748124d0d8ee5d8e1eace9dfbc874bc9564",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d4d5587182664b0c4ab6d3556ce881cb975507c2",
              "lessThan": "9f7007ee9858c99aa43101bc8352c672fee85644",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/net/ethernet/intel/idpf/idpf_dev.c",
            "drivers/net/ethernet/intel/idpf/idpf_vf_dev.c",
            "drivers/net/ethernet/intel/idpf/idpf_virtchnl.c",
            "drivers/net/ethernet/intel/idpf/idpf_virtchnl.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.7",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.7",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.114",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.57",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.8",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T19:20:11.642760Z",
          "id": "CVE-2026-80693",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/41bb8748124d0d8ee5d8e1eace9dfbc874bc9564",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9f7007ee9858c99aa43101bc8352c672fee85644",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a6447b6a9678e701ca4d32789f311067cf528c2d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e299b7d1334ebec4d43a7bb697d10c12df1aaed3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}