{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38184",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38184"
  ],
  "published": "2025-07-04T13:42:19Z",
  "summary": "tipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer\n\nThe reproduction steps:\n1. create a tun interface\n2. enable l2 bearer\n3. TIPC_NL_UDP_GET_REMOTEIP with media name set to tun\n\ntipc: Started in network mode\ntipc: Node identity 8af312d38a21, cluster identity 4711\ntipc: Enabled bearer <eth:syz_tun>, priority 1\nOops: general protection fault\nKASAN: null-ptr-deref in range\nCPU: 1 UID: 1000 PID: 559 Comm: poc Not tainted 6.16.0-rc1+ #117 PREEMPT\nHardware name: QEMU Ubuntu 24.04 PC\nRIP: 0010:tipc_udp_nl_dump_remoteip+0x4a4/0x8f0\n\nthe ub was in fact a struct dev.\n\nwhen bid != 0 && skip_cnt != 0, bearer_list[bid] may be NULL or\nother media when other thread changes it.\n\nfix this by checking media_id.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.142",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38184"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3998283e4c32c0fe69edd59b0876c193f50abce6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c2e17984752b9131061d1a2ca1199da2706337fd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8595350615f952fcf8bc861464a6bf6b1129af50"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/05d332ba075753d569d66333d62d60fff5f57ad8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d3dfe821dfe091c0045044343c8d86596d66e2cf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0d3d91c3500f0c480e016faa4e2259c588616e59"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0f4a72fb266e48dbe928e1d936eab149e4ac3e1b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f82727adcf2992822e12198792af450a76ebd5ef"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is reached through the TIPC generic netlink family (`TIPC_NL_UDP_GET_REMOTEIP` dumpit handler), which requires a local AF_NETLINK socket. No remote packet processing is involved.\nAC:L - The primary path (`bid==0 && skip_cnt==0`) is fully deterministic \u2014 enable an eth bearer on any non-loopback netdev, then dump remoteip by that bearer name; no race needs to be won, and the commit's reproducer is a straightforward three-step PoC.\nPR:L - A local unprivileged account suffices: the TIPC v2 genl ops carry no `GENL_ADMIN_PERM` and the family has no `pre_doit` check, and any residual CAP_NET_ADMIN needed to create the backing netdev is obtainable via `unshare -Urn` since the family is `.netnsok = true`.\nUI:N - The attacker performs every step (bearer enable, netlink dump) from their own process; no victim action or interaction is required.\nS:U - The type confusion and its consequences stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A `struct net_device` is walked as a `struct udp_bearer` list, and each traversed \"node\" has 20 bytes at `ptr - 56` copied into the netlink reply returned to the caller, disclosing kernel memory; the pointer bytes fall in `tc_to_txq[]`, which the same attacker can influence via tc mqprio, moving this toward a controlled kernel read.\nI:H - This is a genuine type confusion \u2014 a `net_device` is dereferenced as a different object type through a partially attacker-influenceable pointer, which per kernel scoring guidance is treated as High integrity impact.\nA:H - The confirmed and trivially reproducible result is a general protection fault / KASAN null-ptr-deref in `tipc_udp_nl_dump_remoteip()`, i.e. a kernel oops that any local user can trigger repeatedly."
    }
  }
}