{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "f24e9980eb860d8600cbe5ef3d2fd9295320d229"
            },
            {
              "fixed": "6e70ef53e818c53eab28d7b0026b7fd03dddaba5"
            },
            {
              "fixed": "ebe76d58a48a48031b98543d86c4cd30a825b622"
            },
            {
              "fixed": "3f42508191e129ee6b5ea96578d5cab14f2a013a"
            },
            {
              "fixed": "ea0d42137f0c06da71e37ffc647aab4c5309599a"
            },
            {
              "fixed": "cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5"
            },
            {
              "fixed": "0f3604cbe4df14c5e58288ac9f57511e726a222d"
            },
            {
              "fixed": "fb176a99e4c1a5a8448a83d83d3606203ba81faa"
            },
            {
              "fixed": "4c79fc2d598694bda845b46229c9d48b65042970"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.34"
            },
            {
              "fixed": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.141"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.91"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.33"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52955.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Fix potential out-of-bounds access in crush_decode()\n\nA message of type CEPH_MSG_OSD_MAP containing a crush map with at least\none bucket has two fields holding the bucket algorithm. If the values\nin these two fields differ, an out-of-bounds access can occur. This is\nthe case because the first algorithm field (alg) is used to allocate\nthe correct amount of memory for a bucket of this type, while the second\nalgorithm field inside the bucket (b-\u003ealg) is used in the subsequent\nprocessing.\n\nThis patch fixes the issue by adding a check that compares alg and\nb-\u003ealg and aborts the processing in case they differ. Furthermore,\nb-\u003ealg is set to 0 in this case, because the destruction of the crush\nmap also uses this field to determine the bucket type, which can again\nresult in an out-of-bounds access when trying to free the memory pointed\nto by the fields of the bucket. To correctly free the memory allocated\nfor the bucket in such a case, the corresponding call to kfree is moved\nfrom the algorithm-specific crush_destroy_bucket functions to the\ngeneric crush_destroy_bucket().",
  "id": "CVE-2026-52955",
  "modified": "2026-07-12T03:54:44.011278424Z",
  "published": "2026-06-24T16:28:37.748Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f3604cbe4df14c5e58288ac9f57511e726a222d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f42508191e129ee6b5ea96578d5cab14f2a013a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c79fc2d598694bda845b46229c9d48b65042970"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e70ef53e818c53eab28d7b0026b7fd03dddaba5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea0d42137f0c06da71e37ffc647aab4c5309599a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ebe76d58a48a48031b98543d86c4cd30a825b622"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb176a99e4c1a5a8448a83d83d3606203ba81faa"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52955.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-52955"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52955.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52955"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492328"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libceph: Fix potential out-of-bounds access in crush_decode()"
}