{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68442",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68442"
  ],
  "published": "2026-08-12T00:06:30Z",
  "summary": "btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps",
  "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->flags 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(&em->list)) 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->flags, restoring the\nbehaviour prior to f86f7a75e2fb.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68442"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2a9246a424f45f33a1b8367052611ebe874868ad"
    },
    {
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      "url": "https://git.kernel.org/stable/c/9304713b70e7e1450e3a76e758836fe5391bfa95"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0e465c63f103a5ce6849614d6bda048d70eebec8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5eff4d5b17fa1950e80bfd1ba43dc0699e61a644"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is in the btrfs in-memory extent map code, reached only through local file operations (write/writeback, fallocate punch hole, truncate, clone, fsync) on a btrfs filesystem; no remote protocol data is involved.\nAC:L - Although the flag is only mis-propagated while an fsync has an extent map flagged for logging, the attacker controls both sides of the race - one thread loops fsync() while another loops writes/punch-hole on the same file - and the resulting bogus map is then freed deterministically by any later drop of that range.\nPR:L - Any unprivileged local user who can create and write a file on a btrfs filesystem (btrfs is the default root fs on several major distros, and /tmp or a home directory suffices) can drive the splitting and logging paths; no capabilities are required.\nUI:N - The attacker performs all the required operations itself (write, punch hole, fsync on its own file); no victim action or administrator involvement is needed.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no crossing of a VM, IOMMU, or other boundary.\nC:H - The freed extent_map stays linked in the inode's modified_extents list, so later traversal in btrfs_log_changed_extents() dereferences freed slab memory; an attacker who reallocates the object controls what is read back, giving a use-after-free read primitive usable to disclose kernel memory.\nI:H - The dangling list node is written through by list_del_init()/list_add_tail() during fsync, writing attacker-influenced pointers into and from a freed heap object; such list-corruption use-after-frees are the classic basis for arbitrary write and privilege escalation.\nA:H - The bug already trips WARN_ON(!list_empty(&em->list)) and then operates on freed memory, causing list corruption and an oops or panic (immediately fatal with panic_on_warn or list debugging enabled), which an unprivileged user can trigger repeatedly."
    }
  }
}