CVE-2026-72399 (GCVE-0-2026-72399)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:43
VLAI
Title
net: enetc: check the number of BDs needed for xdp_frame
Summary
In the Linux kernel, the following vulnerability has been resolved: net: enetc: check the number of BDs needed for xdp_frame The size of xdp_redirect_arr array is ENETC_MAX_SKB_FRAGS. However, the number of fragments contained in xdp_frame may be greater than or equal to ENETC_MAX_SKB_FRAGS, which will cause the access to xdp_redirect_arr to be out of bounds.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9d2b68cc108db2fdb35022ed2d88cfb305c441a6 , < 1ecb199b0e6d12ab6c26c0b7edf1a8f4472d9aed (git)
Affected: 9d2b68cc108db2fdb35022ed2d88cfb305c441a6 , < f55276160ffad3e235b657ee4b7304eb99b90e5c (git)
Affected: 9d2b68cc108db2fdb35022ed2d88cfb305c441a6 , < cfbc6e9b84dcc0aa2d65c84ea4745af327763209 (git)
Affected: 9d2b68cc108db2fdb35022ed2d88cfb305c441a6 , < 1681cc7974a6123f5d5740b03bc11e4784bd2542 (git)
Affected: 9d2b68cc108db2fdb35022ed2d88cfb305c441a6 , < d22829101ab675607ad6c3d420fb3ab875f46bbb (git)
Affected: 9d2b68cc108db2fdb35022ed2d88cfb305c441a6 , < 555c5475e787802eeae0d2b91c2f66c330db2767 (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (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": {
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          "product": "Linux",
          "programFiles": [
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              "version": "7.1.5",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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                  "versionStartIncluding": "5.13",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: enetc: check the number of BDs needed for xdp_frame\n\nThe size of xdp_redirect_arr array is ENETC_MAX_SKB_FRAGS. However, the\nnumber of fragments contained in xdp_frame may be greater than or equal\nto ENETC_MAX_SKB_FRAGS, which will cause the access to xdp_redirect_arr\nto be out of bounds."
        }
      ],
      "metrics": [
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          "cvssV3_1": {
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Remote attackers can deliver multi-fragment frames to an XDP-enabled ingress path that bpf_redirect_map/devmap forwards to an ENETC PF netdev, reaching enetc_xdp_xmit via the standard XDP_REDIRECT flush path without local access.\nAC:L - Once XDP redirect to ENETC is deployed, an attacker can reliably craft or segment traffic to produce xdp_frames with nr_frags+1\u003e13; no race or uncontrollable memory layout is required to trigger the out-of-bounds write.\nPR:N - Exploitation requires no attacker privileges when XDP redirect is pre-deployed on the gateway (normal for edge filtering); unprivileged users with CAP_NET_ADMIN via user namespaces can also attach the needed BPF/XDP programs.\nUI:N - No victim interaction is required beyond sending crafted network traffic; exploitation is fully attacker-driven once the XDP redirect datapath exists.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel/host security boundary, not a cross-VM or IOMMU scope change.\nC:H - Stack out-of-bounds writes of enetc_tx_swbd structures past a 13-element array corrupt adjacent stack data and pointers, providing a memory-corruption primitive that can be leveraged for arbitrary kernel memory disclosure.\nI:H - The overflow writes attacker-influenced enetc_tx_swbd fields (DMA addresses, lengths, frame pointers) beyond the buffer bounds, enabling heap/stack corruption suitable for arbitrary write and potential code execution.\nA:H - Corrupting stack-resident transmit metadata and pointers in enetc_xdp_xmit can cause immediate kernel oops/panic or hung transmit paths, constituting total loss of availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:43:41.891Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/f55276160ffad3e235b657ee4b7304eb99b90e5c"
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/555c5475e787802eeae0d2b91c2f66c330db2767"
        }
      ],
      "title": "net: enetc: check the number of BDs needed for xdp_frame",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72399",
    "datePublished": "2026-08-15T05:56:24.926Z",
    "dateReserved": "2026-08-09T03:40:39.925Z",
    "dateUpdated": "2026-08-17T05:43:41.891Z",
    "state": "PUBLISHED"
  },
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: enetc: check the number of BDs needed for xdp_frame\n\nThe size of xdp_redirect_arr array is ENETC_MAX_SKB_FRAGS. However, the\nnumber of fragments contained in xdp_frame may be greater than or equal\nto ENETC_MAX_SKB_FRAGS, which will cause the access to xdp_redirect_arr\nto be out of bounds."
          }
        ],
        "id": "CVE-2026-72399",
        "lastModified": "2026-08-17T06:19:06.500",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:41:47+00:00",
      "cve": "CVE-2026-72399",
      "id": "CVE-2026-72399",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: enetc: check the number of BDs needed for xdp_frame",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72399.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-15T01:26:12Z",
      "cve": "CVE-2026-72399",
      "id": "CVE-2026-72399",
      "initial_release_date": "2026-08-26T01:14:40Z",
      "product_status:known_affected": "219",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72399",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72399.json",
      "version": "6"
    }
  }
}



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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

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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.


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