CVE-2026-68154 (GCVE-0-2026-68154)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-19 16:30
VLAI
Title
libceph: reject zero bucket types in crush_decode
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < 952ca5dc99913d169263f59fd689f586729a13c1 (git)
Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < 146461f09565afe3665e65b0423d3d6b0fe806c5 (git)
Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < 80fc40e11cda1b5d990a3f69c6efa344fb5cd987 (git)
Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < b8a9fb6bf806f9c4891e71ae1beab0c07c23a877 (git)
Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < 826cd1de5802fd392922785f9b64d76e65d2a100 (git)
Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < 3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56 (git)
Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < 70998f91030ee083ecb336a1dff0701c20a38081 (git)
Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < 05f90284223381005d6bcddab3fda4a97f9c3401 (git)
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Linux Linux Affected: 2.6.34
Unaffected: 0 , < 2.6.34 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: reject zero bucket types in crush_decode\n\nCRUSH bucket type 0 is reserved for devices.  The mapper relies on\nthat invariant and uses type 0 to identify leaf devices.\n\nIf crush_decode() accepts a bucket with type 0, a malformed CRUSH map\ncan make the mapper treat a negative bucket ID as a device and pass it\nto is_out(), which then indexes the OSD weight array with a negative\nvalue.\n\nReject zero bucket types while decoding the CRUSH map so the invalid\nstate never reaches the mapper."
        }
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T23:17:38+00:00",
      "cve": "CVE-2026-68154",
      "id": "CVE-2026-68154",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "261",
      "product_status:known_not_affected": "15",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: libceph: reject zero bucket types in crush_decode",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68154.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-18T00:08:32Z",
      "cve": "CVE-2026-68154",
      "id": "CVE-2026-68154",
      "initial_release_date": "2026-08-18T00:08:32Z",
      "product_status:known_affected": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68154",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68154.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.