{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-53174",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-53174"
  ],
  "published": "2024-12-27T13:53:01Z",
  "summary": "SUNRPC: make sure cache entry active before cache_show",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: make sure cache entry active before cache_show\n\nThe function `c_show` was called with protection from RCU. This only\nensures that `cp` will not be freed. Therefore, the reference count for\n`cp` can drop to zero, which will trigger a refcount use-after-free\nwarning when `cache_get` is called. To resolve this issue, use\n`cache_get_rcu` to ensure that `cp` remains active.\n\n------------[ cut here ]------------\nrefcount_t: addition on 0; use-after-free.\nWARNING: CPU: 7 PID: 822 at lib/refcount.c:25\nrefcount_warn_saturate+0xb1/0x120\nCPU: 7 UID: 0 PID: 822 Comm: cat Not tainted 6.12.0-rc3+ #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.16.1-2.fc37 04/01/2014\nRIP: 0010:refcount_warn_saturate+0xb1/0x120\n\nCall Trace:\n <TASK>\n c_show+0x2fc/0x380 [sunrpc]\n seq_read_iter+0x589/0x770\n seq_read+0x1e5/0x270\n proc_reg_read+0xe1/0x140\n vfs_read+0x125/0x530\n ksys_read+0xc1/0x160\n do_syscall_64+0x5f/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e",
  "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-2024-53174"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e9be26735d055c42543a4d047a769cc6d0fb1504"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/02999e135b013d85c6df738746e8e24699befee4"
    },
    {
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      "url": "https://git.kernel.org/stable/c/c7dac3af57e38b2054f990e573256d90bf887958"
    },
    {
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      "url": "https://git.kernel.org/stable/c/068c0b50f3f700b94f78850834cd91ae3b34c2c1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/acfaf37888e0f0732fb6a50ff093dce6d99994d0"
    },
    {
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      "url": "https://git.kernel.org/stable/c/ec305f303bf070b4f6896b7a76009f702956d402"
    },
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      "url": "https://git.kernel.org/stable/c/d882e2b7fad3f5e5fac66184a347f408813f654a"
    },
    {
      "type": "FIX",
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is triggered by a read() syscall on the procfs file /proc/net/rpc/*/content (path proc_reg_read \u2192 seq_read \u2192 c_show); it requires local access, not network reachability.\nAC:L - The attacker controls both sides of the race \u2014 populating entries by writing the cache's channel file and dropping their refcount by writing flush, while looping reads of content \u2014 so the UAF window can be hit repeatably; per guidance, attacker-controlled races are Low.\nPR:L - In the init namespace content is root-only (mode 400), but an unprivileged user can create a user+network namespace (unshare -Ur; unshare -n) and become root of the fresh per-netns sunrpc caches, gaining read access to content and write access to channel/flush \u2014 empirically verified. This is Low, not High.\nUI:N - The attacker performs the cache population, flush, and read entirely on its own; no victim interaction is needed.\nS:U - The use-after-free is confined to the kernel's own memory/authority; no crossing of a security boundary such as VM or IOMMU is involved.\nC:H - The use-after-free lets c_show read fields of a potentially freed and reallocated cache_head and emit them into the content output the attacker reads, enabling disclosure of freed/reused kernel memory.\nI:H - A use-after-free on the cache_head (with cache_check/cache_put operating on freed, potentially reallocated memory) provides a corruption primitive; per guidance UAFs are scored High for integrity.\nA:H - The use-after-free corrupts refcounting and touches freed memory, readily causing an oops/panic; per guidance any UAF/crash is High."
    }
  }
}