{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "19913b4eac4a230dccb548931358398f45dabe4c"
            },
            {
              "fixed": "61d9f27b191b838b96b697ce0bfaee39a138243a"
            },
            {
              "fixed": "06fb5e623cdc2402d6bb29be94d9beb9a826ffec"
            },
            {
              "fixed": "e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6"
            },
            {
              "fixed": "eff8013c5a8916613c742ae5a2cc341cb605c0ae"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.15.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89652.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: bound copied dentry name length in NFS export get_name\n\nceph_get_name() copies the MDS-supplied name into the caller's\nNAME_MAX-sized buffer with memcpy(name, rinfo-\u003edname, rinfo-\u003edname_len)\nand then writes name[rinfo-\u003edname_len] = 0, without checking dname_len\nagainst NAME_MAX. A malicious or buggy MDS that returns a LOOKUPNAME reply\nwith dname_len \u003e NAME_MAX overflows the buffer. __get_snap_name() copies\nrde-\u003ename / rde-\u003ename_len the same unchecked way.\n\nImpact: a malicious or compromised Ceph MDS overflows the NAME_MAX name\nbuffer in a client's NFS-export get_name path, a slab out-of-bounds write\nreported by KASAN. Reachable when a CephFS mount is re-exported over NFS.\n\nAdd ceph_export_copy_name(), which rejects lengths above NAME_MAX with\n-ENAMETOOLONG before the copy, and use it in both ceph_get_name() and\n__get_snap_name().",
  "id": "CVE-2026-89652",
  "modified": "2026-09-13T03:30:25.449793178Z",
  "published": "2026-09-11T19:45:42.443Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06fb5e623cdc2402d6bb29be94d9beb9a826ffec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/61d9f27b191b838b96b697ce0bfaee39a138243a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eff8013c5a8916613c742ae5a2cc341cb605c0ae"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89652.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89652"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ceph: bound copied dentry name length in NFS export get_name"
}