{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80558",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80558"
  ],
  "published": "2026-08-26T14:37:59Z",
  "summary": "libceph: Avoid using invalid osd indices from primary_temp",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Avoid using invalid osd indices from primary_temp\n\nA corrupted osdmap received from a Ceph monitor or OSD may contain osd\nindices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts\nthat don't exist, i.e., that are greater than max_osd or smaller than\nCEPH_HOMELESS_OSD (-1). These indices are used to create the up and\nacting set in ceph_pg_to_up_acting_osds(), called from calc_target().\nWhile most of these osd indices are checked, the one from primary_temp\nis not. Subsequently, this may lead to calc_target() returning this\n(potentially invalid) index as target osd for a (linger) request.\nBecause the osd_state, osd_weight, and osd_addr arrays only contain\nmax_osd entries (with indices 0 to max_osd -1), this leads to\nout-of-bounds accesses when trying to read values from these arrays.\n\nThis patch fixes the issue by adding a check to get_temp_osds(), so that\nonly valid osd indices from primary_temp are used, and it falls back to\nusing the primary from pg_temp or the up set if it is invalid.\n\n[ idryomov: changelog ]",
  "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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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.46"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.46"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.46"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.46"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80558"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/505fc50b8ff8e687b7e3ef6866269dea27366224"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1c705fe8e59c6b16f48964973fb23c8ec4735b73"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dfe1877d351b99eb1b1a62a3fc2d174220e88e20"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e2ffeec85201b2bb748e99e12539ee1b92f62796"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6799d4a916ffcb3d450d8440f9fe0f0862f768d6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4f392fec075562dc93bb0c69f37423ca2af9b48f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e009c5f0ad634c62f5c48a41f1f3c019ecf52555"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3660b98d1204b419f6a77e9a295f148dcf38d042"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-27T05:18:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - Malformed primary_temp data arrives in CEPH_MSG_OSD_MAP over TCP from a Ceph monitor (mon_dispatch) or OSD (osd_dispatch); calc_target() then uses the bogus osd index in lookup_create_osd()/reopen_osd() to index osd_addr/osd_state/osd_weight without any local syscall.\nAC:L - A compromised or malicious monitor/OSD can publish an incremental osdmap whose primary_temp sets an osd index >= max_osd for a victim PG; once applied, calc_target() on pending I/O, linger requests, or map-driven resends deterministically uses that invalid index.\nPR:N - The attacker acts as the remote Ceph cluster peer delivering forged osdmaps to an already-connected kernel CephFS/RBD client and needs no local account, capabilities, or user-namespace privileges on the victim host.\nUI:N - Once a kernel Ceph client session exists, osdmap updates are applied automatically and scan_requests/kick_requests recalculate targets without any mount, open, or other victim interaction at exploit time.\nS:U - Impact is confined to kernel libceph client memory and state on the Ceph client host (heap disclosure, misrouted connections, crash); it does not cross VM, IOMMU, or container sandbox boundaries to another security authority.\nC:H - Invalid acting.primary indexes past the end of kmalloc-backed osd_addr, osd_state, and osd_weight arrays, performing out-of-bounds reads of adjacent kernel heap memory that can disclose pointers and other sensitive data.\nI:H - Attacker-chosen osd indices drive out-of-bounds reads whose results are treated as authoritative OSD addresses and state for ceph_con_open() and request routing, corrupting kernel client connection targeting in ways usable for further exploitation.\nA:H - Out-of-bounds reads with large crafted osd indices can fault on unmapped kmalloc slack and trigger kernel oops or panic; misrouted linger and I/O requests also cause persistent, repeatable client failure on each malicious osdmap update."
    }
  }
}