{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68154", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.371Z", "datePublished": "2026-08-10T11:59:20.250Z", "dateUpdated": "2026-08-19T16:30:20.481Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:30:20.481Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The flaw is reached when the in-kernel Ceph client decodes a crafted CRUSH map inside CEPH_MSG_OSD_MAP received over TCP from a Ceph monitor or OSD, which is a standard network-delivered cluster control message on connected storage clients.\nAC:L - An attacker can reliably craft a CRUSH map with a bucket whose type field is zero and controlled hierarchy/items so crush_do_rule() later calls is_out() with a negative index, without races, victim-specific memory layout, or rare kernel build options.\nPR:N - No local privileges on the victim host are required; a remote attacker who controls, compromises, or MITMs the authenticated Ceph monitor/OSD peer can deliver the malicious OSD map over the established client cluster connection.\nUI:N - No additional victim action is needed at exploit time because poisoned OSD maps are processed automatically and CRUSH placement is recalculated during routine map updates, request rescanning, and normal Ceph client I/O.\nS:U - The vulnerability corrupts or reads kernel memory on the host running the Ceph client, affecting that kernel security domain rather than crossing a VM, container sandbox, or IOMMU boundary.\nC:H - When a type-0 bucket makes the mapper treat a negative bucket ID as a device, is_out() indexes osd_weight[] with a negative value, causing an out-of-bounds read of adjacent kernel memory beyond the OSD weight array.\nI:H - This out-of-bounds kernel heap access during CRUSH placement is memory corruption in a privileged parser/mapper path that can be leveraged for further kernel memory control and arbitrary code execution, not only information disclosure.\nA:H - The invalid negative indexing during CRUSH mapping can dereference unmapped or non-resident memory and trigger a kernel oops or panic, causing complete loss of availability on affected Ceph client hosts." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/osdmap.c" ], "versions": [ { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "952ca5dc99913d169263f59fd689f586729a13c1", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "146461f09565afe3665e65b0423d3d6b0fe806c5", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "80fc40e11cda1b5d990a3f69c6efa344fb5cd987", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "b8a9fb6bf806f9c4891e71ae1beab0c07c23a877", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "826cd1de5802fd392922785f9b64d76e65d2a100", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "70998f91030ee083ecb336a1dff0701c20a38081", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "05f90284223381005d6bcddab3fda4a97f9c3401", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/osdmap.c" ], "versions": [ { "version": "2.6.34", "status": "affected" }, { "version": "0", "lessThan": "2.6.34", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.2" } ] } ] } ], "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" } ], "title": "libceph: reject zero bucket types in crush_decode", "x_generator": { "engine": "bippy-1.2.0" } } } }