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libceph: Reject monmaps advertising zero monitors

Type: advisorySource: Official CVE List1 source record

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 ]

Announced Source revision 1
Original source ↗

CVE-2026-68155

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-68155

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
        "lessThan": "ba5f0015bfd376d764163045a61c17be75f44dae",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
        "lessThan": "caf082ef8609a6ac26159ce115f55ab7d00231a3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
        "lessThan": "e3ccd4ecab09b22f507f49cb7ed9990c7158ceab",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
        "lessThan": "0591a15815b498be628a937146e44487d599ba33",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
        "lessThan": "cd0d41bc569632eaaeccde9d2a6bc919ec00c407",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
        "lessThan": "e67e8b694872c9bc66996040f9de9242f6236ed9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
        "lessThan": "3b249546f59c3d6d3592c10657f82bc3f1faa07c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ba75bb98cfb93b62c54af25bf67ff90857264bbe",
        "lessThan": "40480eee361ed9676b3f844d532ac28b47251634",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ceph/mon_client.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.34"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.34",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.148",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.101",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.42",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ceph/mon_client.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-68155

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41141 · Revision 1
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Publisher date
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