{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43405",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43405"
  ],
  "published": "2026-05-08T14:22:57Z",
  "summary": "libceph: Use u32 for non-negative values in ceph_monmap_decode()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Use u32 for non-negative values in ceph_monmap_decode()\n\nThis patch fixes unnecessary implicit conversions that change signedness\nof blob_len and num_mon in ceph_monmap_decode().\nCurrently blob_len and num_mon are (signed) int variables. They are used\nto hold values that are always non-negative and get assigned in\nceph_decode_32_safe(), which is meant to assign u32 values. Both\nvariables are subsequently used as unsigned values, and the value of\nnum_mon is further assigned to monmap->num_mon, which is of type u32.\nTherefore, both variables should be of type u32. This is especially\nrelevant for num_mon. If the value read from the incoming message is\nvery large, it is interpreted as a negative value, and the check for\nnum_mon > CEPH_MAX_MON does not catch it. This leads to the attempt to\nallocate a very large chunk of memory for monmap, which will most likely\nfail. In this case, an unnecessary attempt to allocate memory is\nperformed, and -ENOMEM is returned instead of -EINVAL.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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  "references": [
    {
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43405"
    },
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      "url": "https://git.kernel.org/stable/c/ee5588e2bc41acb73f6676c0520420c107cd0140"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
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      "scenario": "AV:N - The vulnerable decoder processes CEPH_MSG_MON_MAP data received over the Ceph monitor TCP connection from a remote peer.\nAC:L - Triggering requires sending a single malformed monmap with a large u32 num_mon value; there is no race or condition outside the attacker's control once they control the monitor-side message stream.\nPR:N - The attacker needs no privileges on the vulnerable host; a malicious or compromised Ceph monitor endpoint can supply the crafted network message.\nUI:N - Although Ceph clients are initially created by mount or RBD setup, monitor map updates are received asynchronously over an established session and do not require further victim action.\nS:U - The impact remains within the kernel/Ceph client security authority and does not cross a VM, sandbox, or hardware isolation boundary.\nC:N - The signedness bug causes an oversized allocation attempt that fails; the investigated path does not expose kernel memory or create a read primitive.\nI:N - The allocation is overflow-safe and fails before the monmap is installed or populated, so there is no demonstrated memory corruption or data modification primitive.\nA:H - A crafted monmap can repeatedly force huge kernel allocation attempts and prevent the client from obtaining or refreshing a valid monitor map, denying Ceph storage availability in affected deployments."
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}