{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38660",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38660"
  ],
  "published": "2025-08-22T16:01:13Z",
  "summary": "[ceph] parse_longname(): strrchr() expects NUL-terminated string",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\n[ceph] parse_longname(): strrchr() expects NUL-terminated string\n\n... and parse_longname() is not guaranteed that.  That's the reason\nwhy it uses kmemdup_nul() to build the argument for kstrtou64();\nthe problem is, kstrtou64() is not the only thing that need it.\n\nJust get a NUL-terminated copy of the entire thing and be done\nwith that...",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/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-2025-38660"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4b9aee707c4580511983a0998547f3b28514e6a6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bb80f7618832d26f7e395f52f82b1dac76223e5f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3145b2b11492d61c512bbc59660bb823bc757f48"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/493479af8af3ab907f49e99323777d498a4fbd2b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/101841c38346f4ca41dc1802c867da990ffb32eb"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The unterminated string is dentry-name data read directly out of a Ceph MDS reply message (`info->dname = *p`, `_name = *p`) sitting in the kvmalloc'd `msg->front` buffer, so a malicious/compromised MDS or an on-path attacker on unencrypted cephfs traffic supplies it remotely. No local caller can produce a non-NUL-terminated name.\nAC:L - The attacker fully controls the reply contents and the exact `front_len`, so they can place the name flush against the end of the allocation and make the overread deterministic; the only build requirement is `CONFIG_FS_ENCRYPTION=y`, which is standard in distro and Android kernels, and no encryption key or encrypted directory is needed since `parse_longname()` runs before those checks.\nPR:N - The attacker holds no account or privilege on the victim client \u2014 the malicious reply is processed by the messenger/MDS-client code with no authorization check on the client side. Any process's routine directory access on the already-established mount suffices to consume it.\nUI:N - The snapdir condition depends on the server-supplied `snapid`, so a hostile MDS can mark an ordinary directory as `CEPH_SNAPDIR` and trigger the path on any normal readdir or lookup \u2014 no deliberate `.snap` access, remount, or other victim action is required.\nS:U - The out-of-bounds access is confined to kernel memory within the same security authority as the ceph client; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `strrchr()` reads unbounded adjacent kernel heap until it finds a NUL, and the resulting inflated `*name_len` causes those out-of-bounds bytes to be base64-decoded and propagated into the dentry name handed back toward userspace, giving an unbounded kernel memory disclosure primitive.\nI:H - The corrupted `*name_len` is no longer bounded by the `NAME_MAX` check (which was applied to the pre-parse copy), so `ceph_base64_decode()` and `fscrypt_fname_disk_to_usr()` write far past the end of the `NAME_MAX` fscrypt buffer or the message front buffer, yielding a heap out-of-bounds write with attacker-influenced data.\nA:H - The overread walks off a kvmalloc allocation and can hit a vmalloc guard page or unmapped memory, and the derived oversized length drives a heap overflow \u2014 either produces an oops/panic in the ceph messenger work context, and the attacker can repeat it on every reply."
    }
  }
}