{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/skbuff.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7fa93e39fbb0566019c388a8038a4d58552e0910",
              "status": "affected",
              "version": "7c4e983c4f3cf94fcd879730c6caa877e0768a4d",
              "versionType": "git"
            },
            {
              "lessThan": "3c77a377877acbaf03cd7caa21d3644a5dd16301",
              "status": "affected",
              "version": "7c4e983c4f3cf94fcd879730c6caa877e0768a4d",
              "versionType": "git"
            },
            {
              "lessThan": "9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f",
              "status": "affected",
              "version": "7c4e983c4f3cf94fcd879730c6caa877e0768a4d",
              "versionType": "git"
            },
            {
              "lessThan": "7e692df3933628d974acb9f5b334d2b3e885e2a6",
              "status": "affected",
              "version": "7c4e983c4f3cf94fcd879730c6caa877e0768a4d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/skbuff.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.29",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.29",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.16",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3.3",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix skb_copy_ubufs() vs BIG TCP\n\nDavid Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy\nusing hugepages, and skb length bigger than ~68 KB.\n\nskb_copy_ubufs() assumed it could copy all payload using up to\nMAX_SKB_FRAGS order-0 pages.\n\nThis assumption broke when BIG TCP was able to put up to 512 KB per skb.\n\nWe did not hit this bug at Google because we use CONFIG_MAX_SKB_FRAGS=45\nand limit gso_max_size to 180000.\n\nA solution is to use higher order pages if needed.\n\nv2: add missing __GFP_COMP, or we leak memory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code only runs on locally-originated TX skbs carrying MSG_ZEROCOPY frags; received network packets never carry zcopy frags (skb_zcopy() is false, early return), so a remote peer cannot reach it. Triggering requires local socket/syscall activity.\nAC:L - The local attacker controls every precondition \u2014 enabling BIG TCP (CAP_NET_ADMIN via user namespace on a private netns device), using THP/hugepage-backed buffers, and sending MSG_ZEROCOPY payloads sized to overflow \u2014 so the overflow is reliably reproducible.\nPR:L - Exploitation requires running local code (MSG_ZEROCOPY sendmsg) and CAP_NET_ADMIN to raise gso_max_size, both available to a basic unprivileged user through an unprivileged user+network namespace. No real root is needed.\nUI:N - The attacker triggers the overflow entirely through its own socket operations; no action by another user is required.\nS:U - The out-of-bounds write corrupts kernel heap within the same kernel security authority; there is no crossing of a VM/IOMMU/sandbox boundary.\nC:H - The OOB write corrupts skb_shared_info frag page descriptors, which can be steered so kernel data is read/transmitted from attacker-influenced pages, and per guidance memory corruption leveragable for disclosure scores High.\nI:H - This is a controllable-size out-of-bounds heap write (frag descriptors written past the frags array), providing a write primitive suitable for control-flow hijacking or privilege escalation.\nA:H - The overflow reliably corrupts adjacent memory and was reported as causing kernel crashes (oops/panic), a full denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:15:25.435Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7fa93e39fbb0566019c388a8038a4d58552e0910"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c77a377877acbaf03cd7caa21d3644a5dd16301"
        },
        {
          "url": "https://git.kernel.org/stable/c/9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e692df3933628d974acb9f5b334d2b3e885e2a6"
        }
      ],
      "title": "tcp: fix skb_copy_ubufs() vs BIG TCP",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53669",
    "datePublished": "2025-10-07T15:21:26.896Z",
    "dateReserved": "2025-10-07T15:16:59.663Z",
    "dateUpdated": "2026-08-05T09:15:25.435Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}