{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38154",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38154"
  ],
  "published": "2025-07-03T08:36:23Z",
  "summary": "bpf, sockmap: Avoid using sk_socket after free when sending",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Avoid using sk_socket after free when sending\n\nThe sk->sk_socket is not locked or referenced in backlog thread, and\nduring the call to skb_send_sock(), there is a race condition with\nthe release of sk_socket. All types of sockets(tcp/udp/unix/vsock)\nwill be affected.\n\nRace conditions:\n'''\nCPU0                               CPU1\n\nbacklog::skb_send_sock\n  sendmsg_unlocked\n    sock_sendmsg\n      sock_sendmsg_nosec\n                                   close(fd):\n                                     ...\n                                     ops->release() -> sock_map_close()\n                                     sk_socket->ops = NULL\n                                     free(socket)\n      sock->ops->sendmsg\n            ^\n            panic here\n'''\n\nThe ref of psock become 0 after sock_map_close() executed.\n'''\nvoid sock_map_close()\n{\n    ...\n    if (likely(psock)) {\n    ...\n    // !! here we remove psock and the ref of psock become 0\n    sock_map_remove_links(sk, psock)\n    psock = sk_psock_get(sk);\n    if (unlikely(!psock))\n        goto no_psock; <=== Control jumps here via goto\n        ...\n        cancel_delayed_work_sync(&psock->work); <=== not executed\n        sk_psock_put(sk, psock);\n        ...\n}\n'''\n\nBased on the fact that we already wait for the workqueue to finish in\nsock_map_close() if psock is held, we simply increase the psock\nreference count to avoid race conditions.\n\nWith this patch, if the backlog thread is running, sock_map_close() will\nwait for the backlog thread to complete and cancel all pending work.\n\nIf no backlog running, any pending work that hasn't started by then will\nfail when invoked by sk_psock_get(), as the psock reference count have\nbeen zeroed, and sk_psock_drop() will cancel all jobs via\ncancel_delayed_work_sync().\n\nIn summary, we require synchronization to coordinate the backlog thread\nand close() thread.\n\nThe panic I catched:\n'''\nWorkqueue: events sk_psock_backlog\nRIP: 0010:sock_sendmsg+0x21d/0x440\nRAX: 0000000000000000 RBX: ffffc9000521fad8 RCX: 0000000000000001\n...\nCall Trace:\n <TASK>\n ? die_addr+0x40/0xa0\n ? exc_general_protection+0x14c/0x230\n ? asm_exc_general_protection+0x26/0x30\n ? sock_sendmsg+0x21d/0x440\n ? sock_sendmsg+0x3e0/0x440\n ? __pfx_sock_sendmsg+0x10/0x10\n __skb_send_sock+0x543/0xb70\n sk_psock_backlog+0x247/0xb80\n...\n'''",
  "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-2025-38154"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4edb40b05cb6a261775abfd8046804ca139a5546"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b19cbf0b9a91f5a0d93fbcd761ff71c48ab40ed9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4c6fa65ab2aec7df94809478c8d28ef38676a1b7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/15c0250dae3b48a398447d2b364603821ed4ed90"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7c0a16f6ea2b1c82a03bccd5d1bdb4a7bbd4d987"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8259eb0e06d8f64c700f5fbdb28a5c18e10de291"
    }
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  "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 race is closed by a local `close(fd)` on a sockmap-enrolled socket concurrent with the BPF backlog worker; while remote peer data drives the backlog side, the attacker must be local to control the socket lifetime. BPF/sockmap is Local per kernel scoring guidance.\nAC:L - The attacker controls both sides of the race \u2014 it generates the redirected traffic that schedules `sk_psock_backlog()` and picks the `close()` timing \u2014 and can repeat the attempt in a tight loop until it wins. No condition outside its influence is required.\nPR:L - An unprivileged local process suffices in the real deployments of this feature (Cilium/Istio sockops redirect, BPF-token-delegated containers), where a privileged agent enrols workload sockets into the sockmap and the attacker only needs to send/redirect data and close its own fd.\nUI:N - No victim action is needed; the attacker drives both the traffic and the close from its own process.\nS:U - The use-after-free and any resulting corruption remain within the kernel's own security authority, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - Use-after-free on `struct socket` \u2014 the freed object can be resprayed from `sock_inode_cachep`, causing redirected payload to be transmitted through a stale/attacker-influenced socket and permitting kernel memory disclosure.\nI:H - `security_socket_sendmsg()` and `READ_ONCE(sock->ops)->sendmsg` dereference and indirect-call through a pointer loaded from freed memory, giving a control-flow hijack primitive once the freed `struct socket` is reclaimed with attacker-groomed contents.\nA:H - The maintainer reproduced a general-protection fault in `sock_sendmsg()` from the `sk_psock_backlog` workqueue; the NULLed `sock->ops` alone guarantees a fatal kernel oops in worker context."
    }
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}