sock_map: avoid race between sock_map_close and sk_psock_put

{
  "id": "7a203e4b4648023cc70776caf3c9592fc997d8d6a884508b5d48007c91e02d85",
  "url": "https://osv.dev/vulnerability/CVE-2024-39500",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "sock_map: avoid race between sock_map_close and sk_psock_put",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: sock_map: avoid race between sock_map_close and sk_psock_put sk_psock_get will return NULL if the refcount of psock has gone to 0, which will happen when the last call of sk_psock_put is done. However, sk_psock_drop may not have finished yet, so the close callback will still point to sock_map_close despite psock being NULL. This can be reproduced with a thread deleting an element from the sock map, while the second one creates a socket, adds it to the map and closes it. That will trigger the WARN_ON_ONCE: ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7220 at net/core/sock_map.c:1701 sock_map_close+0x2a2/0x2d0 net/core/sock_map.c:1701 Modules linked in: CPU: 1 PID: 7220 Comm: syz-executor380 Not tainted 6.9.0-syzkaller-07726-g3c999d1ae3c7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:sock_map_close+0x2a2/0x2d0 net/core/sock_map.c:1701 Code: df e8 92 29 88 f8 48 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 79 29 88 f8 4c 8b 23 eb 89 e8 4f 15 23 f8 90 <0f> 0b 90 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 13 26 3d 02 RSP: 0018:ffffc9000441fda8 EFLAGS: 00010293 RAX: ffffffff89731ae1 RBX: ffffffff94b87540 RCX: ffff888029470000 RDX: 0000000000000000 RSI: ffffffff8bcab5c0 RDI: ffffffff8c1faba0 RBP: 0000000000000000 R08: ffffffff92f9b61f R09: 1ffffffff25f36c3 R10: dffffc0000000000 R11: fffffbfff25f36c4 R12: ffffffff89731840 R13: ffff",
    "evidence": "osv:CVE-2024-39500",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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    "severity": "high",
    "structured": {
      "id": "CVE-2024-39500",
      "aliases": [
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          "type": "CVSS_V3",
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      "modified": "2026-10-28T02:30:47.007373913Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3627605de498639a3c586c8684d12c89cba11073",
        "https://git.kernel.org/stable/c/4959ffc65a0e94f8acaac20deac49f89e6ded52d",
        "https://git.kernel.org/stable/c/4b4647add7d3c8530493f7247d11e257ee425bf0",
        "https://git.kernel.org/stable/c/5eabdf17fed2ad41b836bb4055ec36d95e512c50",
        "https://git.kernel.org/stable/c/e946428439a0d2079959f5603256ac51b6047017",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/39xxx/CVE-2024-39500.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-39500",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514992,
  "published_at": "2024-07-12T12:20:34.317+00:00"
}