{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9"
            },
            {
              "fixed": "2a9246a424f45f33a1b8367052611ebe874868ad"
            },
            {
              "fixed": "9304713b70e7e1450e3a76e758836fe5391bfa95"
            },
            {
              "fixed": "0e465c63f103a5ce6849614d6bda048d70eebec8"
            },
            {
              "fixed": "5eff4d5b17fa1950e80bfd1ba43dc0699e61a644"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "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-2026-68442.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps\n\nWhen btrfs_drop_extent_map_range() splits an extent map, the new split\nmaps inherit the original map's flags through a local 'flags' variable.\nCommit f86f7a75e2fb (\"btrfs: use the flags of an extent map to identify\nthe compression type\") changed the EXTENT_FLAG_LOGGING clearing to\noperate on em-\u003eflags instead of that local 'flags' copy, so a split of\nan extent map that is currently being logged wrongly inherits\nEXTENT_FLAG_LOGGING.\n\nThe flag is then never cleared on the split, and when it is freed while\nstill on the inode's modified_extents list (for example by the extent\nmap shrinker) it trips the WARN_ON(!list_empty(\u0026em-\u003elist)) in\nbtrfs_free_extent_map() and leads to a use-after-free.\n\nClear EXTENT_FLAG_LOGGING from the local 'flags' copy used for the\nsplits and only clear EXTENT_FLAG_PINNED from em-\u003eflags, restoring the\nbehaviour prior to f86f7a75e2fb.",
  "id": "CVE-2026-68442",
  "modified": "2026-08-18T03:30:59.209759622Z",
  "published": "2026-08-12T00:07:31.981Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e465c63f103a5ce6849614d6bda048d70eebec8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a9246a424f45f33a1b8367052611ebe874868ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5eff4d5b17fa1950e80bfd1ba43dc0699e61a644"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9304713b70e7e1450e3a76e758836fe5391bfa95"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68442.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68442"
    },
    {
      "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": "btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps"
}