{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "22e9947a4b2ba255888541bd0111cf00b9b16586"
            },
            {
              "fixed": "330249609b70778094a7a36f5b6bcfa6362121d4"
            },
            {
              "fixed": "deff41898a5ae3a47db5fa1896a494aa95efda5d"
            },
            {
              "fixed": "95376fe9c145be35566991df99c53134943d992f"
            },
            {
              "fixed": "466f187b501a5ac8e1ea2ccf3ccd5c46108d8830"
            },
            {
              "fixed": "b5fa40226e71c17847b9ff2816c6ca4133d0d994"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.1.0"
            },
            {
              "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68148.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfscrypt: Add missing superblock check in find_or_insert_direct_key()\n\nThe legacy 'fscrypt_direct_keys' table caches master keys that are used\nby v1 encryption policies that have FSCRYPT_POLICY_FLAG_DIRECT_KEY.\nIt's just a global table for all filesystems (since the keys can be\nprovided by the legacy process-subscribed keyrings mechanism, which\nmakes it difficult to reuse super_block::s_master_keys).\n\nThe entries in it ('struct fscrypt_direct_key') do contain a super_block\npointer, though, for passing to fscrypt_destroy_inline_crypt_key() when\nthe last inode that references the key is evicted.\n\nHowever, when finding the fscrypt_direct_key for an inode, we weren't\nactually comparing the super_block pointer.  As a result, inodes with\ndifferent super_blocks could point to the same fscrypt_direct_key.  That\ncould extend the lifetime of a fscrypt_direct_key beyond the\nsuper_block it points to, causing a use-after-free later.\n\nFix this by creating distinct fscrypt_direct_key structs for distinct\nsuper_block structs.\n\nNote that this problem doesn't exist in the v2 policy equivalent\n(\"per-mode keys\"), since the data structures there are per super_block.",
  "id": "CVE-2026-68148",
  "modified": "2026-08-12T03:51:17.408606722Z",
  "published": "2026-08-10T11:59:13.413Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/330249609b70778094a7a36f5b6bcfa6362121d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/466f187b501a5ac8e1ea2ccf3ccd5c46108d8830"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95376fe9c145be35566991df99c53134943d992f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5fa40226e71c17847b9ff2816c6ca4133d0d994"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/deff41898a5ae3a47db5fa1896a494aa95efda5d"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68148.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68148"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "fscrypt: Add missing superblock check in find_or_insert_direct_key()"
}