{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28"
            },
            {
              "fixed": "9ef44ed6fb0c1db01cfcc3de432a33e719713eb5"
            },
            {
              "fixed": "d693c5ed67dabe1ccbf8dcea93075bdc9ffd4ca0"
            },
            {
              "fixed": "ba5cc05dae8fce237d191c7ea96b1107a791e548"
            },
            {
              "fixed": "c05a0ec1cdced622a1a0c7d85679fe02f31033ec"
            },
            {
              "fixed": "17eb9832a10db2f7a80cb429ca2bc5038445a943"
            },
            {
              "fixed": "fe09dd288722f1c749b7506c0b3e7841a7d85027"
            },
            {
              "fixed": "e09f7bd7273928b4089e6b71f8e992f2b356ca1b"
            },
            {
              "fixed": "a48802fb2cd2d1e23651989f8ff4d15e9d5dad54"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74256.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: fix integer overflow in bpf_msg_pop_data() bounds check\n\nstart and len are u32, so\n\n\tu64 last = start + len;\n\nevaluates start + len in 32-bit and wraps before storing it in last.\nThe bounds check\n\n\tif (start \u003e= offset + l || last \u003e msg-\u003esg.size)\n\t\treturn -EINVAL;\n\ncan then be passed with an out-of-range start/len, after which the pop\nloop runs off the end of the scatterlist and sk_msg_shift_left() calls\nput_page() on the empty msg-\u003esg.end slot:\n\n  Oops: general protection fault, probably for non-canonical address\n  0xdffffc0000000001: 0000 [#1] SMP KASAN PTI\n  KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\n  RIP: 0010:sk_msg_shift_left net/core/filter.c:2957 [inline]\n  RIP: 0010:____bpf_msg_pop_data net/core/filter.c:3103 [inline]\n  RIP: 0010:bpf_msg_pop_data+0x753/0x1a10 net/core/filter.c:2984\n  Call Trace:\n   \u003cTASK\u003e\n   bpf_prog_4cc92c278f4d5d56+0x1b1/0x1e8\n   bpf_prog_run_pin_on_cpu+0x107/0x320 include/linux/filter.h:746\n   sk_psock_msg_verdict+0x357/0x7f0 net/core/skmsg.c:934\n   tcp_bpf_send_verdict net/ipv4/tcp_bpf.c:420 [inline]\n   tcp_bpf_sendmsg+0x766/0x1ae0 net/ipv4/tcp_bpf.c:583\n   __sock_sendmsg+0x153/0x1c0 net/socket.c:802\n   __sys_sendto+0x326/0x430 net/socket.c:2265\n   __x64_sys_sendto+0xe3/0x100 net/socket.c:2268\n   do_syscall_64+0x14c/0x480\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n   \u003c/TASK\u003e\n\nWiden the addition with a (u64) cast so the bound is evaluated in\n64-bit and a len near U32_MAX no longer wraps below msg-\u003esg.size.\n\nWhile here, change pop from int to u32. It counts bytes against the\nunsigned scatterlist lengths and can never be negative, so the signed\ntype only invites sign-confusion in the pop loop.",
  "id": "CVE-2026-74256",
  "modified": "2026-08-18T03:30:54.687251640Z",
  "published": "2026-08-15T05:57:34.956Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17eb9832a10db2f7a80cb429ca2bc5038445a943"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9ef44ed6fb0c1db01cfcc3de432a33e719713eb5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a48802fb2cd2d1e23651989f8ff4d15e9d5dad54"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba5cc05dae8fce237d191c7ea96b1107a791e548"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c05a0ec1cdced622a1a0c7d85679fe02f31033ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d693c5ed67dabe1ccbf8dcea93075bdc9ffd4ca0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e09f7bd7273928b4089e6b71f8e992f2b356ca1b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe09dd288722f1c749b7506c0b3e7841a7d85027"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74256.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74256"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "bpf, sockmap: fix integer overflow in bpf_msg_pop_data() bounds check"
}