CVE-2025-40053 (GCVE-0-2025-40053)
Vulnerability from cvelistv5
Published
2025-10-28 11:48
Modified
2026-08-05 12:07
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: dlink: handle copy_thresh allocation failure The driver did not handle failure of `netdev_alloc_skb_ip_align()`. If the allocation failed, dereferencing `skb->protocol` could lead to a NULL pointer dereference. This patch tries to allocate `skb`. If the allocation fails, it falls back to the normal path. Tested-on: D-Link DGE-550T Rev-A3
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/dlink/dl2k.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/dlink/dl2k.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.246",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.195",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.156",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.246",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.195",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
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                  "vulnerable": true
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                  "versionEndExcluding": "6.6.112",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.53",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dlink: handle copy_thresh allocation failure\n\nThe driver did not handle failure of `netdev_alloc_skb_ip_align()`.\nIf the allocation failed, dereferencing `skb-\u003eprotocol` could lead to\na NULL pointer dereference.\n\nThis patch tries to allocate `skb`. If the allocation fails, it falls\nback to the normal path.\n\nTested-on: D-Link DGE-550T Rev-A3"
        }
      ],
      "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 - The vulnerable code is the NIC RX completion path reached solely by frames arriving on the wire, and small IP packets routed from anywhere on the internet land in this path. No local access or account on the target is needed.\nAC:L - The gating condition is a GFP_ATOMIC skb allocation failure, which an attacker can reliably drive by flooding the interface and exhausting memory while simultaneously supplying the short frames that take the copy-break branch. The identical stmmac RX-exhaustion NULL deref was scored AC:L.\nPR:N - Frames are processed in the interrupt handler before any socket, credential, or filtering decision, so an unauthenticated attacker with no account on the system triggers the path just by sending traffic.\nUI:N - Packet reception and the resulting dereference happen autonomously in the driver\u0027s interrupt handler; no local user action is required.\nS:U - The fault occurs in the kernel and its impact is confined to the same kernel security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:N - The dereference is at a fixed small offset from NULL with no attacker control over the address or any returned data, so no kernel memory contents are disclosed.\nI:N - The only write is `skb-\u003edev = dev` at a fixed NULL-page offset that is unmapped under mmap_min_addr; it yields no controlled write primitive and modifies no kernel data.\nA:H - The NULL dereference occurs in hard-IRQ context, producing a fatal exception in interrupt and a full kernel panic, and it can be re-triggered by an unauthenticated remote attacker."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:07:23.851Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/84fd710a704f3d53d4120e452e86cea558cf73a8"
        },
        {
          "url": "https://git.kernel.org/stable/c/5aa9b885602811a026a3f45c92ea2b4b04c54f09"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d49e4b14609e1a20d931e718962c4b6b5485174"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea87151df398d407a632c7bf63013290f01c5009"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ed5010fef0930f4322d620052edc854ef3ec41f"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd7b6b2c920d7fd370a612be416a904d6e1ebe55"
        },
        {
          "url": "https://git.kernel.org/stable/c/8169a6011c5fecc6cb1c3654c541c567d3318de8"
        }
      ],
      "title": "net: dlink: handle copy_thresh allocation failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40053",
    "datePublished": "2025-10-28T11:48:28.444Z",
    "dateReserved": "2025-04-16T07:20:57.157Z",
    "dateUpdated": "2026-08-05T12:07:23.851Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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