{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90225",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90225"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "nfc: llcp: read llcp_sock->local under the socket lock in getsockopt",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: read llcp_sock->local under the socket lock in getsockopt\n\nnfc_llcp_getsockopt() read llcp_sock->local before lock_sock(sk) and\nthen dereferenced the cached pointer inside the locked region.\nllcp_sock_bind() assigns and clears llcp_sock->local under the same\nsocket lock, dropping the last reference on its error path. A\ngetsockopt() racing an in-flight bind() can observe the pointer, block\non lock_sock(), and then dereference a freed nfc_llcp_local once bind()\nhas unwound.\n\nMove the llcp_sock->local read and the NULL check inside the\nlock_sock(sk) region so bind() cannot mutate or free the pointer between\nthe load and the use.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-90225"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/56fd158fef20268f48db6cdfe5d722e930134eda"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8ba8cec0586727cc135ca4827921fc7b52946d71"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ed5240bab3468988077fe8bf29b935eaecc9ff89"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fe65727a4a21b11c18eebae1338482767a897b76"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2d8ac24565be85bf56580b87bf1b874d35625eb5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/156e65bd29307f5053835bff60bc1ba342fa010f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d1b73962675cdc5a58e2707e25b548d8b495fde0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/36812527052c5bfb1ec6c1e292d67a5bf76b750f"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-18T17:55:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is triggered by racing local syscalls on an AF_NFC LLCP socket: getsockopt(2) (__sys_getsockopt \u2192 do_sock_getsockopt \u2192 nfc_llcp_getsockopt) against bind(2) (__sys_bind \u2192 llcp_sock_bind). No LLCP PDU or other NFC-peer bytes are consumed on this path, so an adjacent radio peer cannot drive it.\nAC:L - The attacker owns both sides of the lock_sock(sk) race: one thread calls bind() with service_name_len 0 so nfc_llcp_get_sdp_ssap() returns LLCP_SAP_MAX after llcp_sock->local is stored, and another calls getsockopt(SOL_NFC, NFC_LLCP_RW) on the same socket, which used to snapshot that pointer before taking the lock.\nPR:L - llcp_sock_create() checks capable(CAP_NET_RAW) only for SOCK_RAW; nfc_llcp_getsockopt is on llcp_sock_ops for SOCK_STREAM/DGRAM. An unprivileged user in init_net can socket(AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP) then bind/getsockopt. nfc_llcp_find_local() needs a registered NFC device, which is typical on phones.\nUI:N - The attacker creates the AF_NFC LLCP socket and issues bind() and getsockopt() on that fd themselves; no other user needs to tap a tag, mount media, or accept a connection.\nS:U - The freed object is the host kernel's kmalloc'd nfc_llcp_local used by nfc_llcp_getsockopt(); impact stays inside the kernel's security authority, not a VM, IOMMU, or sandbox escape.\nC:H - nfc_llcp_getsockopt() dereferences the dangling nfc_llcp_local to read local->rw, local->miux, local->remote_miu, and local->remote_lto and copies those values to userspace with put_user(), so reclaim of the freed slab yields an arbitrary-read primitive.\nI:H - llcp_sock_bind()'s sock_llcp_put_local path drops nfc_llcp_local via nfc_llcp_local_put() while nfc_llcp_getsockopt() still holds the pointer; reclaiming that kmalloc object with attacker-controlled data turns the dangling local into a write/control-flow primitive.\nA:H - Using the freed nfc_llcp_local in nfc_llcp_getsockopt() (the local->rw and local->remote_lto loads) is a kernel slab UAF that oopses or panics on KASAN/SLUB_DEBUG and can crash the system even when not fully exploited."
    }
  }
}