libceph: Avoid using invalid osd indices from primary_temp

{
  "id": "5b93e37f4c3575ba66c31879f0bc83c75b503eff48a6ce6c1fa197b4248820cd",
  "url": "https://osv.dev/vulnerability/CVE-2026-80558",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "libceph: Avoid using invalid osd indices from primary_temp",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: libceph: Avoid using invalid osd indices from primary_temp A corrupted osdmap received from a Ceph monitor or OSD may contain osd indices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts that don't exist, i.e., that are greater than max_osd or smaller than CEPH_HOMELESS_OSD (-1). These indices are used to create the up and acting set in ceph_pg_to_up_acting_osds(), called from calc_target(). While most of these osd indices are checked, the one from primary_temp is not. Subsequently, this may lead to calc_target() returning this (potentially invalid) index as target osd for a (linger) request. Because the osd_state, osd_weight, and osd_addr arrays only contain max_osd entries (with indices 0 to max_osd -1), this leads to out-of-bounds accesses when trying to read values from these arrays. This patch fixes the issue by adding a check to get_temp_osds(), so that only valid osd indices from primary_temp are used, and it falls back to using the primary from pg_temp or the up set if it is invalid. [ idryomov: changelog ]",
    "evidence": "osv:CVE-2026-80558",
    "products": [
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    "severity": "critical",
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      "id": "CVE-2026-80558",
      "aliases": [
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      "metrics": [
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          "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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      "modified": "2026-10-28T02:30:22.904938385Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1c705fe8e59c6b16f48964973fb23c8ec4735b73",
        "https://git.kernel.org/stable/c/3660b98d1204b419f6a77e9a295f148dcf38d042",
        "https://git.kernel.org/stable/c/4f392fec075562dc93bb0c69f37423ca2af9b48f",
        "https://git.kernel.org/stable/c/505fc50b8ff8e687b7e3ef6866269dea27366224",
        "https://git.kernel.org/stable/c/6799d4a916ffcb3d450d8440f9fe0f0862f768d6",
        "https://git.kernel.org/stable/c/dfe1877d351b99eb1b1a62a3fc2d174220e88e20",
        "https://git.kernel.org/stable/c/e009c5f0ad634c62f5c48a41f1f3c019ecf52555",
        "https://git.kernel.org/stable/c/e2ffeec85201b2bb748e99e12539ee1b92f62796",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80558.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80558",
        "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/2026/80xxx/CVE-2026-80558.json"
      }
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        "value": "CVE-2026-80558",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489309,
  "published_at": "2026-08-26T14:37:24.768+00:00"
}