CVE-2026-64355 (GCVE-0-2026-64355)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-08-17 04:54
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject fragmented frames in devmap Devmap broadcast redirects clone the packet for all but the last destination. For native XDP, that clone path copies only the linear xdp_frame data, while fragmented frames keep skb_shared_info in tailroom outside the linear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but without valid frag metadata, and the later free path can interpret uninitialized tail data as skb_shared_info, leading to an out-of-bounds access during frame return. Reject fragmented native XDP frames in dev_map_enqueue_clone(). Add the same restriction to the generic XDP clone path in dev_map_redirect_clone(). Generic XDP represents fragmented packets as nonlinear skbs, and rejecting them here keeps clone-based broadcast support aligned between native and generic XDP.
References
Impacted products
Vendor Product Version
Linux Linux Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
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{
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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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\nbpf: Reject fragmented frames in devmap\n\nDevmap broadcast redirects clone the packet for all but the last\ndestination.\n\nFor native XDP, that clone path copies only the linear xdp_frame data,\nwhile fragmented frames keep skb_shared_info in tailroom outside the\nlinear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but\nwithout valid frag metadata, and the later free path can interpret\nuninitialized tail data as skb_shared_info, leading to an out-of-bounds\naccess during frame return.\n\nReject fragmented native XDP frames in dev_map_enqueue_clone().\n\nAdd the same restriction to the generic XDP clone path in\ndev_map_redirect_clone(). Generic XDP represents fragmented packets as\nnonlinear skbs, and rejecting them here keeps clone-based broadcast\nsupport aligned between native and generic XDP."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "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 - A remote peer can send an oversized packet that a fragment-capable NIC represents as a multi-buffer XDP frame, reaching the vulnerable devmap broadcast clone path on a configured forwarding host.\nAC:L - No race or uncontrollable timing condition is required; fragmented packets reliably enter the faulty clone path and can be sent repeatedly.\nPR:N - Although initial-namespace CAP_BPF and CAP_NET_ADMIN are needed to configure the XDP deployment, the attacker sending packets through the already-configured unauthenticated data path needs no privileges.\nUI:N - Packet reception and XDP processing occur automatically without victim action.\nS:U - The corruption compromises resources governed by the same host-kernel security authority and does not inherently cross a VM, IOMMU, or other distinct boundary.\nC:H - Uninitialized fragment descriptors are consumed as page references and can be used by scatter-gather transmitters for unintended DMA mappings, potentially exposing arbitrary kernel memory.\nI:H - An uninitialized fragment count can overrun fixed-size driver arrays, while bogus page references can cause invalid refcount decrements, premature frees, and exploitable kernel memory corruption.\nA:H - Invalid fragment metadata can fault during DMA mapping, transmission, or frame return and cause a kernel oops or panic; an attacker can trigger this repeatedly."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:54:01.161Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/47baddc856ae7e93a565dd9deeb797999b179466"
        },
        {
          "url": "https://git.kernel.org/stable/c/07a4c11ee8ef4abcb39d922e9e410ae269671cdf"
        },
        {
          "url": "https://git.kernel.org/stable/c/bccbab36ff228e0825eb85d9b0f9b8434cd0a399"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5b4f5efcb55c1af3fe44ff712d31b7fb098a831"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9bb2d9c798cb62a4050a991c27b752770c33afe"
        },
        {
          "url": "https://git.kernel.org/stable/c/51d07c12ca411e692c424ecdabf077f1e61a61be"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa496720618f1a6054f1c870bf10b4f6c99bf656"
        }
      ],
      "title": "bpf: Reject fragmented frames in devmap",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64355",
    "datePublished": "2026-07-25T08:50:13.410Z",
    "dateReserved": "2026-07-19T15:36:31.782Z",
    "dateUpdated": "2026-08-17T04:54:01.161Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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