{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "22e9947a4b2ba255888541bd0111cf00b9b16586"
            },
            {
              "fixed": "bab016bb80d74a9d1f7d4121a7fc1cb529b470e0"
            },
            {
              "fixed": "4462ac3d90e897dda52ce4b6af2d526ddae835a8"
            },
            {
              "fixed": "97a688563be71ec6fefc071aff69a66c69dbe244"
            },
            {
              "fixed": "81ea8e8221853950c47dac7164f27c63a96f8f86"
            },
            {
              "fixed": "bc2d630296e0e049210ec05ff08459a6893ae749"
            },
            {
              "fixed": "6fe4e4b8259e1330945b5f3c9476e08473b8e0e8"
            }
          ],
          "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": "6.1.183"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "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-2026-68147.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfscrypt: Avoid dynamic allocation in fscrypt_get_devices()\n\nWhen a blk_crypto_key starts being used or is evicted, fs/crypto/ calls\nfscrypt_get_devices() to get the filesystem's list of block devices,\nthen iterates over them and calls blk_crypto_config_supported(),\nblk_crypto_start_using_key(), or blk_crypto_evict_key() on each one.\n\nCurrently, the block device pointers are placed in a dynamically\nallocated array.  This dynamic allocation is problematic because:\n\n- It can fail, especially at the fscrypt_destroy_inline_crypt_key() call\n  site when it's invoked for inode eviction under direct reclaim.\n\n- fscrypt_destroy_inline_crypt_key() doesn't handle the failure.  It\n  just zeroizes and frees the blk_crypto_key without calling\n  blk_crypto_evict_key().  That causes a use-after-free.\n\nFor now, let's fix this in the straightforward and easily-backportable\nway by switching to an on-stack array.  Currently the fscrypt\nmulti-device functionality is used only by f2fs, which has a hardcoded\nlimit of 8 block devices.  An on-stack array works fine for that.\n\n(Of course, this solution won't scale up to large number of block\ndevices.  For that we'd need a different solution, like moving the block\ndevice iteration into the filesystem.  Or in the case of btrfs, which\nwill only support blk-crypto-fallback, we should make it just call\nblk-crypto-fallback directly, so the block devices won't be needed.)",
  "id": "CVE-2026-68147",
  "modified": "2026-08-21T03:30:10.679813371Z",
  "published": "2026-08-10T11:59:12.308Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4462ac3d90e897dda52ce4b6af2d526ddae835a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6fe4e4b8259e1330945b5f3c9476e08473b8e0e8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81ea8e8221853950c47dac7164f27c63a96f8f86"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97a688563be71ec6fefc071aff69a66c69dbe244"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bab016bb80d74a9d1f7d4121a7fc1cb529b470e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc2d630296e0e049210ec05ff08459a6893ae749"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68147.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68147"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "fscrypt: Avoid dynamic allocation in fscrypt_get_devices()"
}