CVE-2026-99046 (GCVE-0-2026-99046)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:22 – Updated: 2026-10-24 14:10
VLAI
Title
gve: fix XSK buffer leak on error descriptor
Summary
In the Linux kernel, the following vulnerability has been resolved: gve: fix XSK buffer leak on error descriptor When the error bit is set in the RX completion descriptor, the buf_state and its attached buffer should be freed. In the case of AF_XDP ZC, the XSK buffer was not freed, leading to a leak. This issue was caught by LLM.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c1fffc5d66a7147d557736c2341a511e0896d9ff , < 06656aaa7e43ae62b673c2244d27099b8b94a70d (git)
Affected: c1fffc5d66a7147d557736c2341a511e0896d9ff , < 889f763874855c575429f75946132a53c573aa14 (git)
Affected: c1fffc5d66a7147d557736c2341a511e0896d9ff , < 9fed6a8ab8a5bacba2c709cb19d2dd6d2fa9112e (git)
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Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/google/gve/gve_rx_dqo.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "c1fffc5d66a7147d557736c2341a511e0896d9ff",
              "versionType": "git"
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              "versionType": "git"
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              "versionType": "git"
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/google/gve/gve_rx_dqo.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"
            },
            {
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              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "6.17",
                  "vulnerable": true
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                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngve: fix XSK buffer leak on error descriptor\n\nWhen the error bit is set in the RX completion descriptor, the buf_state\nand its attached buffer should be freed. In the case of AF_XDP ZC, the\nXSK buffer was not freed, leading to a leak.\n\nThis issue was caught by LLM."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - A malformed Ethernet/IP packet received by gVNIC produces a DQO completion whose rx_error field denotes an invalid packet; gve_intr_dqo() schedules gve_napi_poll_dqo(), which reaches the patched gve_rx_dqo() through gve_rx_poll_dqo().\nAC:L - With a DQO-RDA AF_XDP zero-copy queue active, the sender can repeatedly transmit packets classified by the device as invalid; gve_rx_dqo() then deterministically takes the rx_error branch without a race or memory-layout dependency.\nPR:N - The gve_rx_dqo() receive path performs no authentication or capability check; xsk_create()\u0027s CAP_NET_RAW check and XDP attachment are victim-side service provisioning, while the remote sender needs only packet access.\nUI:N - After gve_reg_xsk_pool() activates the pool, gve_intr_dqo() and NAPI process each error completion automatically without any victim action.\nS:U - The leak affects the guest kernel\u0027s own GVE XSK pool and DQO receive queue; it neither bypasses an IOMMU nor crosses the guest/hypervisor boundary.\nC:N - The lost xdp_buff_xsk remains allocated but unreturned; the branch performs no out-of-bounds read or data return, and gve_alloc_buf_state() clears the stale pointer before reusing the state.\nI:N - In the vulnerable XSK case, gve_free_buffer() releases only page-pool state and the buf_state while leaving the XSK object allocated, causing resource loss without a dangling access, memory corruption, or unauthorized modification.\nA:H - Each error completion omits xsk_buff_free()/xp_free(), removing one frame from the fixed XSK pool; repetition makes xsk_buff_alloc() fail in gve_alloc_buffer(), prevents RX-buffer reposting, and can stop the bound receive queue until the pool or service is reset."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:10:10.249Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/06656aaa7e43ae62b673c2244d27099b8b94a70d"
        },
        {
          "url": "https://git.kernel.org/stable/c/889f763874855c575429f75946132a53c573aa14"
        },
        {
          "url": "https://git.kernel.org/stable/c/9fed6a8ab8a5bacba2c709cb19d2dd6d2fa9112e"
        }
      ],
      "title": "gve: fix XSK buffer leak on error descriptor",
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      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99046",
    "datePublished": "2026-10-23T12:22:10.460Z",
    "dateReserved": "2026-09-25T10:25:14.388Z",
    "dateUpdated": "2026-10-24T14:10:10.249Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-99046",
      "date": "2026-10-25",
      "epss": "0.00527",
      "percentile": "0.44357"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-25T01:05:33.000Z",
      "cve": "CVE-2026-99046",
      "id": "msrc_CVE-2026-99046",
      "initial_release_date": "2026-10-25T01:05:33.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "gve: fix XSK buffer leak on error descriptor",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99046.json",
      "version": "1"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
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                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/ethernet/google/gve/gve_rx_dqo.c"
                ],
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                "vendor": "Linux",
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                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                    "versionType": "semver"
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                    "version": "6.18.57",
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                    "version": "7.2.11",
                    "versionType": "semver"
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                    "status": "unaffected",
                    "version": "7.3",
                    "versionType": "original_commit_for_fix"
                  }
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              }
            ],
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          }
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngve: fix XSK buffer leak on error descriptor\n\nWhen the error bit is set in the RX completion descriptor, the buf_state\nand its attached buffer should be freed. In the case of AF_XDP ZC, the\nXSK buffer was not freed, leading to a leak.\n\nThis issue was caught by LLM."
          }
        ],
        "id": "CVE-2026-99046",
        "lastModified": "2026-10-24T14:16:53.497",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
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              "impactScore": 3.6,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        "published": "2026-10-23T13:17:28.073",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/06656aaa7e43ae62b673c2244d27099b8b94a70d"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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