{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "fd09af010788a884de1c39537c288830c3d305db"
            },
            {
              "fixed": "18e3ffde1822f0b48b1753bf34aa97ce839df1d8"
            },
            {
              "fixed": "10f86a2a5c91fc4c4d001960f1c21abe52545ef6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "48be3df15aa19c04eadf156c9129293c9a10389f"
            },
            {
              "last_affected": "cd4644d904e1d153d516e73e2e127e7a2fe687e1"
            },
            {
              "last_affected": "6e0bc946cbeec538322820786b5fb5200a2216ab"
            },
            {
              "last_affected": "a7e52f7f675046d9ffc5692d815fa67c82fcdbf5"
            },
            {
              "last_affected": "db7f8c57dbdd31f7e59f8dc8d1e1b38607a320ef"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.7.18"
            },
            {
              "fixed": "5.8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.8.4"
            },
            {
              "fixed": "5.9"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.4.61"
            },
            {
              "fixed": "5.5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.9.0"
            },
            {
              "fixed": "7.0.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53078.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix same-register dst/src OOB read and pointer leak in sock_ops\n\nWhen a BPF sock_ops program accesses ctx fields with dst_reg == src_reg,\nthe SOCK_OPS_GET_SK() and SOCK_OPS_GET_FIELD() macros fail to zero the\ndestination register in the !fullsock / !locked_tcp_sock path.\n\nBoth macros borrow a temporary register to check is_fullsock /\nis_locked_tcp_sock when dst_reg == src_reg, because dst_reg holds the\nctx pointer. When the check is false (e.g., TCP_NEW_SYN_RECV state with\na request_sock), dst_reg should be zeroed but is not, leaving the stale\nctx pointer:\n\n - SOCK_OPS_GET_SK: dst_reg retains the ctx pointer, passes NULL checks\n   as PTR_TO_SOCKET_OR_NULL, and can be used as a bogus socket pointer,\n   leading to stack-out-of-bounds access in helpers like\n   bpf_skc_to_tcp6_sock().\n\n - SOCK_OPS_GET_FIELD: dst_reg retains the ctx pointer which the\n   verifier believes is a SCALAR_VALUE, leaking a kernel pointer.\n\nFix both macros by:\n - Changing JMP_A(1) to JMP_A(2) in the fullsock path to skip the\n   added instruction.\n - Adding BPF_MOV64_IMM(si-\u003edst_reg, 0) after the temp register\n   restore in the !fullsock path, placed after the restore because\n   dst_reg == src_reg means we need src_reg intact to read ctx-\u003etemp.",
  "id": "CVE-2026-53078",
  "modified": "2026-07-15T01:48:52.061859724Z",
  "published": "2026-06-24T16:30:18.858Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10f86a2a5c91fc4c4d001960f1c21abe52545ef6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18e3ffde1822f0b48b1753bf34aa97ce839df1d8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53078.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53078"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops"
}