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libceph: reject zero bucket types in crush_decode

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: libceph: reject zero bucket types in crush_decode CRUSH bucket type 0 is reserved for devices. The mapper relies on that invariant and uses type 0 to identify leaf devices. If crush_decode() accepts a bucket with type 0, a malformed CRUSH map can make the mapper treat a negative bucket ID as a device and pass it to is_out(), which then indexes the OSD weight array with a negative value. Reject zero bucket types while decoding the CRUSH map so the invalid state never reaches the mapper.

Announced Source revision 1
Original source ↗

CVE-2026-68154

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-2026-68154

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": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
        "lessThan": "952ca5dc99913d169263f59fd689f586729a13c1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
        "lessThan": "146461f09565afe3665e65b0423d3d6b0fe806c5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
        "lessThan": "80fc40e11cda1b5d990a3f69c6efa344fb5cd987",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
        "lessThan": "b8a9fb6bf806f9c4891e71ae1beab0c07c23a877",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
        "lessThan": "826cd1de5802fd392922785f9b64d76e65d2a100",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
        "lessThan": "3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
        "lessThan": "70998f91030ee083ecb336a1dff0701c20a38081",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
        "lessThan": "05f90284223381005d6bcddab3fda4a97f9c3401",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ceph/osdmap.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": "5.10.265",
        "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/osdmap.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-68154

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#41140 · Revision 1
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Publisher date
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