CVE-2026-68155 (GCVE-0-2026-68155)
Vulnerability from cvelistv5
Published
2026-08-10 11:59
Modified
2026-10-19 20:58
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: Reject monmaps advertising zero monitors A message of type CEPH_MSG_MON_MAP contains a monmap that is sent from a monitor to the client. This monmap contains information about the existing monitors in the cluster. Currently, a monmap indicating that there are zero monitors in the cluster is treated as valid. However, it is impossible to have zero monitors in the cluster and still receive a valid monmap from a monitor. Therefore, such a monmap must be corrupted and should be treated as invalid. Furthermore, a monmap with a monitor count of zero can subsequently crash the client when attempting to open a session with a monitor in __open_session(). This happens because the "BUG_ON(monc->monmap->num_mon < 1)" assertion in pick_new_mon() is triggered. This patch extends a check in ceph_monmap_decode() to also reject arriving mon_maps with num_mon == 0 rather than only with num_mon > CEPH_MAX_MON. [ idryomov: drop "log output for unusual values of num_mon" part ]
References
Impacted products
Vendor Product Version
Linux Linux Version: ba75bb98cfb93b62c54af25bf67ff90857264bbe
Version: ba75bb98cfb93b62c54af25bf67ff90857264bbe
Version: ba75bb98cfb93b62c54af25bf67ff90857264bbe
Version: ba75bb98cfb93b62c54af25bf67ff90857264bbe
Version: ba75bb98cfb93b62c54af25bf67ff90857264bbe
Version: ba75bb98cfb93b62c54af25bf67ff90857264bbe
Version: ba75bb98cfb93b62c54af25bf67ff90857264bbe
Version: ba75bb98cfb93b62c54af25bf67ff90857264bbe
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This monmap contains information about the\\nexisting monitors in the cluster. Currently, a monmap indicating that\\nthere are zero monitors in the cluster is treated as valid. However, it\\nis impossible to have zero monitors in the cluster and still receive a\\nvalid monmap from a monitor. Therefore, such a monmap must be corrupted\\nand should be treated as invalid. Furthermore, a monmap with a monitor\\ncount of zero can subsequently crash the client when attempting to open\\na session with a monitor in __open_session(). This happens because the\\n\\\"BUG_ON(monc-\u003emonmap-\u003enum_mon \u003c 1)\\\" assertion in pick_new_mon() is\\ntriggered.\\n\\nThis patch extends a check in ceph_monmap_decode() to also reject\\narriving mon_maps with num_mon == 0 rather than only with\\nnum_mon \u003e CEPH_MAX_MON.\\n\\n[ idryomov: drop \\\"log output for unusual values of num_mon\\\" part ]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.271\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"2.6.34\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-03T10:55:38.556Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68155\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:58:54.643Z\", \"dateReserved\": \"2026-07-30T09:28:09.371Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T11:59:21.200Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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