{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.180-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.100-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.5-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  bpf, sockmap: fix integer overflow in bpf_msg_pop_data() bounds check  start and len are u32, so  \tu64 last = start + len;  evaluates start + len in 32-bit and wraps before storing it in last. The bounds check  \tif (start \u003e= offset + l || last \u003e msg-\u003esg.size) \t\treturn -EINVAL;  can then be passed with an out-of-range start/len, after which the pop loop runs off the end of the scatterlist and sk_msg_shift_left() calls put_page() on the empty msg-\u003esg.end slot:    Oops: general protection fault, probably for non-canonical address   0xdffffc0000000001: 0000 [#1] SMP KASAN PTI   KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]   RIP: 0010:sk_msg_shift_left net/core/filter.c:2957 [inline]   RIP: 0010:____bpf_msg_pop_data net/core/filter.c:3103 [inline]   RIP: 0010:bpf_msg_pop_data+0x753/0x1a10 net/core/filter.c:2984   Call Trace:    \u003cTASK\u003e    bpf_prog_4cc92c278f4d5d56+0x1b1/0x1e8    bpf_prog_run_pin_on_cpu+0x107/0x320 include/linux/filter.h:746    sk_psock_msg_verdict+0x357/0x7f0 net/core/skmsg.c:934    tcp_bpf_send_verdict net/ipv4/tcp_bpf.c:420 [inline]    tcp_bpf_sendmsg+0x766/0x1ae0 net/ipv4/tcp_bpf.c:583    __sock_sendmsg+0x153/0x1c0 net/socket.c:802    __sys_sendto+0x326/0x430 net/socket.c:2265    __x64_sys_sendto+0xe3/0x100 net/socket.c:2268    do_syscall_64+0x14c/0x480    entry_SYSCALL_64_after_hwframe+0x77/0x7f    \u003c/TASK\u003e  Widen the addition with a (u64) cast so the bound is evaluated in 64-bit and a len near U32_MAX no longer wraps below msg-\u003esg.size.  While here, change pop from int to u32. It counts bytes against the unsigned scatterlist lengths and can never be negative, so the signed type only invites sign-confusion in the pop loop.",
  "id": "DEBIAN-CVE-2026-74256",
  "modified": "2026-09-14T16:47:26.865988805Z",
  "published": "2026-08-15T06:22:24.743Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-74256"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-74256"
  ]
}