{"id":"CVE-2026-68154","summary":"libceph: reject zero bucket types in crush_decode","details":"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.","modified":"2026-08-14T04:02:22.262550019Z","published":"2026-08-10T11:59:20.250Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68154.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/05f90284223381005d6bcddab3fda4a97f9c3401"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56"},{"type":"WEB","url":"https://git.kernel.org/stable/c/70998f91030ee083ecb336a1dff0701c20a38081"},{"type":"WEB","url":"https://git.kernel.org/stable/c/826cd1de5802fd392922785f9b64d76e65d2a100"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b8a9fb6bf806f9c4891e71ae1beab0c07c23a877"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68154.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68154"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f24e9980eb860d8600cbe5ef3d2fd9295320d229"},{"fixed":"b8a9fb6bf806f9c4891e71ae1beab0c07c23a877"},{"fixed":"826cd1de5802fd392922785f9b64d76e65d2a100"},{"fixed":"3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56"},{"fixed":"70998f91030ee083ecb336a1dff0701c20a38081"},{"fixed":"05f90284223381005d6bcddab3fda4a97f9c3401"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68154.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.34"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68154.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}