SUNRPC: make sure cache entry active before cache_show

{
  "id": "24d4d9a3b70c437ee857c2f3737f93be4de3aab5e523ab754a2a200b96d7a930",
  "url": "https://osv.dev/vulnerability/CVE-2024-53174",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "SUNRPC: make sure cache entry active before cache_show",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: SUNRPC: make sure cache entry active before cache_show The function `c_show` was called with protection from RCU. This only ensures that `cp` will not be freed. Therefore, the reference count for `cp` can drop to zero, which will trigger a refcount use-after-free warning when `cache_get` is called. To resolve this issue, use `cache_get_rcu` to ensure that `cp` remains active. ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 7 PID: 822 at lib/refcount.c:25 refcount_warn_saturate+0xb1/0x120 CPU: 7 UID: 0 PID: 822 Comm: cat Not tainted 6.12.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:refcount_warn_saturate+0xb1/0x120 Call Trace: c_show+0x2fc/0x380 [sunrpc] seq_read_iter+0x589/0x770 seq_read+0x1e5/0x270 proc_reg_read+0xe1/0x140 vfs_read+0x125/0x530 ksys_read+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e",
    "evidence": "osv:CVE-2024-53174",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.287",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.231",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.174",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.120",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.64",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.11.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-53174",
      "aliases": [
        "CVE-2024-53174"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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              "type": "GIT",
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                {
                  "fixed": "02999e135b013d85c6df738746e8e24699befee4"
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                {
                  "fixed": "c7dac3af57e38b2054f990e573256d90bf887958"
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                {
                  "fixed": "068c0b50f3f700b94f78850834cd91ae3b34c2c1"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-53174.json"
          }
        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "4.20.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:49.612907717Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/02999e135b013d85c6df738746e8e24699befee4",
        "https://git.kernel.org/stable/c/068c0b50f3f700b94f78850834cd91ae3b34c2c1",
        "https://git.kernel.org/stable/c/2862eee078a4d2d1f584e7f24fa50dddfa5f3471",
        "https://git.kernel.org/stable/c/acfaf37888e0f0732fb6a50ff093dce6d99994d0",
        "https://git.kernel.org/stable/c/c7dac3af57e38b2054f990e573256d90bf887958",
        "https://git.kernel.org/stable/c/d882e2b7fad3f5e5fac66184a347f408813f654a",
        "https://git.kernel.org/stable/c/e9be26735d055c42543a4d047a769cc6d0fb1504",
        "https://git.kernel.org/stable/c/ec305f303bf070b4f6896b7a76009f702956d402",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53174.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-53174",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53174.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-53174",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517745,
  "published_at": "2024-12-27T13:49:18.892+00:00"
}