CVE-2026-74616 (GCVE-0-2026-74616)
Vulnerability from cvelistv5
Published
2026-08-22 15:32
Modified
2026-08-25 05:40
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: xdp: reject clones that overrun skb_shared_info tailroom xdpf_clone() clones broadcast copies into a single page and sets frame_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that page like a normal XDP frame and expects the usual skb_shared_info tailroom at the end of the buffer. The current check only rejects frames whose linear xdp_frame header, headroom, and packet data exceed PAGE_SIZE. A source frame backed by a larger allocation can still satisfy that check while extending into the clone's required shared-info area. When such a clone is converted back into an skb, build_skb_around() places skb_shared_info over live packet bytes and later writes can corrupt XDP return metadata. Reject clones unless their linear area fits inside SKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already enforced by the XDP-to-skb conversion path.
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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/xdp.c"
          ],
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          "vendor": "Linux",
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        },
        {
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "version": "6.1.183",
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            },
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.1.183",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxdp: reject clones that overrun skb_shared_info tailroom\n\nxdpf_clone() clones broadcast copies into a single page and sets\nframe_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that\npage like a normal XDP frame and expects the usual skb_shared_info\ntailroom at the end of the buffer.\n\nThe current check only rejects frames whose linear xdp_frame header,\nheadroom, and packet data exceed PAGE_SIZE. A source frame backed by a\nlarger allocation can still satisfy that check while extending into the\nclone\u0027s required shared-info area. When such a clone is converted back\ninto an skb, build_skb_around() places skb_shared_info over live packet\nbytes and later writes can corrupt XDP return metadata.\n\nReject clones unless their linear area fits inside\nSKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already\nenforced by the XDP-to-skb conversion path."
        }
      ],
      "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 - Remote packets on an XDP ingress netdev whose program calls bpf_xdp_redirect_map() with BPF_F_BROADCAST reach xdpf_clone() through dev_map_enqueue_multi(); edge L4 load balancers and container fan-out to veth peers are common deployments where cloned frames later hit __xdp_build_skb_from_frame() without any local attacker access.\nAC:L - Once broadcast devmap redirect is deployed, an attacker can reliably craft linear frames whose headroom plus payload fall in the SKB_WITH_OVERHEAD(PAGE_SIZE)..PAGE_SIZE window; no race, timing luck, or uncontrollable memory layout is required and the condition can be retried with each packet.\nPR:N - Loading/attaching the XDP program and populating the devmap requires CAP_BPF and CAP_NET_ADMIN on the host, but an unauthenticated remote sender on the already-configured datapath needs no privileges on the victim system, matching the CNA pattern used for the related devmap broadcast clone issue CVE-2026-64355.\nUI:N - Exploitation is driven entirely by network traffic processed in NAPI/softirq after XDP redirect; no victim mount, file open, or other interactive action is required beyond packets reaching the configured interface.\nS:U - The flaw corrupts skb_shared_info placement and metadata within the host kernel address space during skb construction; it does not inherently cross VM, hypervisor, or IOMMU security boundaries.\nC:H - build_skb_around() places skb_shared_info over live packet bytes and memset initializes it there; subsequent skb/shinfo access can read kernel metadata and adjacent buffer contents beyond intended bounds, constituting exploitable out-of-bounds memory disclosure.\nI:H - Overlapping skb_shared_info tailroom lets kernel writes corrupt packet data and lets attacker-influenced bytes corrupt shinfo fields used by later stack, GRO, and transmit paths, giving an out-of-bounds write primitive over frame metadata.\nA:H - Tailroom overlap during __xdp_build_skb_from_frame() can fault or corrupt state during skb construction and downstream processing, producing kernel oops/panic; an attacker can trigger this repeatedly with crafted packets on the broadcast redirect path."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:40:43.432Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/58408982fa39f9758124cec169f42854d6f98f35"
        },
        {
          "url": "https://git.kernel.org/stable/c/685edea27ac68d08fe4dbd3de74b858d2ad8e830"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba13763d667e008e185fedf592d53846a5b457d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef4b7c7046d29a67090de15af0da0d1ae8d1b192"
        },
        {
          "url": "https://git.kernel.org/stable/c/fab820f1691a9e26d9031f18aae1e9ce09078f92"
        },
        {
          "url": "https://git.kernel.org/stable/c/f463b6f4957c9c3fd1c75f8d3e5af4879fa609c0"
        },
        {
          "url": "https://git.kernel.org/stable/c/e48e8edbef2eb824201495daa5234560f632b23c"
        }
      ],
      "title": "xdp: reject clones that overrun skb_shared_info tailroom",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74616",
    "datePublished": "2026-08-22T15:32:01.313Z",
    "dateReserved": "2026-08-15T05:44:03.920Z",
    "dateUpdated": "2026-08-25T05:40:43.432Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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