{"id":"CVE-2026-68154","title":"libceph: reject zero bucket types in crush_decode","summary":"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 de…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 952ca5dc99913d169263f59fd689f586729a13c1","Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 146461f09565afe3665e65b0423d3d6b0fe806c5","Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 80fc40e11cda1b5d990a3f69c6efa344fb5cd987","Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < b8a9fb6bf806f9c4891e71ae1beab0c07c23a877","Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 826cd1de5802fd392922785f9b64d76e65d2a100","Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56","Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 70998f91030ee083ecb336a1dff0701c20a38081","Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 05f90284223381005d6bcddab3fda4a97f9c3401","Linux 2.6.34"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T15:45:00.533524Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:00.744Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68154","references":[{"url":"https://git.kernel.org/stable/c/952ca5dc99913d169263f59fd689f586729a13c1"},{"url":"https://git.kernel.org/stable/c/146461f09565afe3665e65b0423d3d6b0fe806c5"},{"url":"https://git.kernel.org/stable/c/80fc40e11cda1b5d990a3f69c6efa344fb5cd987"},{"url":"https://git.kernel.org/stable/c/b8a9fb6bf806f9c4891e71ae1beab0c07c23a877"},{"url":"https://git.kernel.org/stable/c/826cd1de5802fd392922785f9b64d76e65d2a100"},{"url":"https://git.kernel.org/stable/c/3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56"},{"url":"https://git.kernel.org/stable/c/70998f91030ee083ecb336a1dff0701c20a38081"},{"url":"https://git.kernel.org/stable/c/05f90284223381005d6bcddab3fda4a97f9c3401"}],"tags":["cve.org"],"epss":0.00714,"epssPercentile":0.52732,"ingestedAt":"2026-10-16T17:24:46.846Z","slug":"CVE-2026-68154","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 952ca5dc99913d169263f59fd689f586729a13c1`\n- `Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 146461f09565afe3665e65b0423d3d6b0fe806c5`\n- `Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 80fc40e11cda1b5d990a3f69c6efa344fb5cd987`\n- `Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < b8a9fb6bf806f9c4891e71ae1beab0c07c23a877`\n- `Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 826cd1de5802fd392922785f9b64d76e65d2a100`\n- `Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56`\n- `Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 70998f91030ee083ecb336a1dff0701c20a38081`\n- `Linux >= f24e9980eb860d8600cbe5ef3d2fd9295320d229 < 05f90284223381005d6bcddab3fda4a97f9c3401`\n- `Linux 2.6.34`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}