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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ceph/osdmap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "952ca5dc99913d169263f59fd689f586729a13c1",
              "status": "affected",
              "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
              "versionType": "git"
            },
            {
              "lessThan": "146461f09565afe3665e65b0423d3d6b0fe806c5",
              "status": "affected",
              "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
              "versionType": "git"
            },
            {
              "lessThan": "80fc40e11cda1b5d990a3f69c6efa344fb5cd987",
              "status": "affected",
              "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
              "versionType": "git"
            },
            {
              "lessThan": "b8a9fb6bf806f9c4891e71ae1beab0c07c23a877",
              "status": "affected",
              "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
              "versionType": "git"
            },
            {
              "lessThan": "826cd1de5802fd392922785f9b64d76e65d2a100",
              "status": "affected",
              "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
              "versionType": "git"
            },
            {
              "lessThan": "3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56",
              "status": "affected",
              "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
              "versionType": "git"
            },
            {
              "lessThan": "70998f91030ee083ecb336a1dff0701c20a38081",
              "status": "affected",
              "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
              "versionType": "git"
            },
            {
              "lessThan": "05f90284223381005d6bcddab3fda4a97f9c3401",
              "status": "affected",
              "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ceph/osdmap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.34"
            },
            {
              "lessThan": "2.6.34",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.148",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:30:20.481Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68154",
    "datePublished": "2026-08-10T11:59:20.250Z",
    "dateReserved": "2026-07-30T09:28:09.371Z",
    "dateUpdated": "2026-08-19T16:30:20.481Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-68154",
      "date": "2026-09-21",
      "epss": "0.00704",
      "percentile": "0.51476"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "net/ceph/osdmap.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "952ca5dc99913d169263f59fd689f586729a13c1",
                    "status": "affected",
                    "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "146461f09565afe3665e65b0423d3d6b0fe806c5",
                    "status": "affected",
                    "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "80fc40e11cda1b5d990a3f69c6efa344fb5cd987",
                    "status": "affected",
                    "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "b8a9fb6bf806f9c4891e71ae1beab0c07c23a877",
                    "status": "affected",
                    "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "826cd1de5802fd392922785f9b64d76e65d2a100",
                    "status": "affected",
                    "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56",
                    "status": "affected",
                    "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "70998f91030ee083ecb336a1dff0701c20a38081",
                    "status": "affected",
                    "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "05f90284223381005d6bcddab3fda4a97f9c3401",
                    "status": "affected",
                    "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "net/ceph/osdmap.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "2.6.34"
                  },
                  {
                    "lessThan": "2.6.34",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.265",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.216",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.183",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.148",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.101",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.42",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.1.*",
                    "status": "unaffected",
                    "version": "7.1.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.2",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-68154",
        "lastModified": "2026-08-19T17:20:32.537",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-10T13:20:01.533",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/05f90284223381005d6bcddab3fda4a97f9c3401"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/146461f09565afe3665e65b0423d3d6b0fe806c5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/70998f91030ee083ecb336a1dff0701c20a38081"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/80fc40e11cda1b5d990a3f69c6efa344fb5cd987"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/826cd1de5802fd392922785f9b64d76e65d2a100"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/952ca5dc99913d169263f59fd689f586729a13c1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b8a9fb6bf806f9c4891e71ae1beab0c07c23a877"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T11:17:34+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": "16",
      "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": "2026-09-18T00:35:07Z",
      "cve": "CVE-2026-68154",
      "id": "CVE-2026-68154",
      "initial_release_date": "2026-08-18T00:08:32Z",
      "product_status:first_fixed": "23",
      "product_status:known_affected": "731",
      "product_status:recommended": "107",
      "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": "9"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.