{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40233",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-40233"
  ],
  "published": "2025-12-04T15:33:57Z",
  "summary": "ocfs2: clear extent cache after moving/defragmenting extents",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: clear extent cache after moving/defragmenting extents\n\nThe extent map cache can become stale when extents are moved or\ndefragmented, causing subsequent operations to see outdated extent flags. \nThis triggers a BUG_ON in ocfs2_refcount_cal_cow_clusters().\n\nThe problem occurs when:\n1. copy_file_range() creates a reflinked extent with OCFS2_EXT_REFCOUNTED\n2. ioctl(FITRIM) triggers ocfs2_move_extents()\n3. __ocfs2_move_extents_range() reads and caches the extent (flags=0x2)\n4. ocfs2_move_extent()/ocfs2_defrag_extent() calls __ocfs2_move_extent()\n   which clears OCFS2_EXT_REFCOUNTED flag on disk (flags=0x0)\n5. The extent map cache is not invalidated after the move\n6. Later write() operations read stale cached flags (0x2) but disk has\n   updated flags (0x0), causing a mismatch\n7. BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) triggers\n\nFix by clearing the extent map cache after each extent move/defrag\noperation in __ocfs2_move_extents_range().  This ensures subsequent\noperations read fresh extent data from disk.",
  "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-2025-40233"
    },
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is reached through the OCFS2_IOC_MOVE_EXT ioctl and a subsequent write()/read() on a local file descriptor, requiring local system access. No remote protocol handler is involved.\nAC:L - The trigger is a deterministic, fully attacker-controlled sequence (copy_file_range \u2192 OCFS2_IOC_MOVE_EXT \u2192 write) with no race window, no memory-layout dependency, and no reliance on any condition outside the attacker's control; syzbot reproduced it reliably.\nPR:L - OCFS2_IOC_MOVE_EXT has no capability check whatsoever (unlike FITRIM in the same switch which requires CAP_SYS_ADMIN); any unprivileged local user holding a writable fd on a regular file of a mounted ocfs2 volume can drive the whole sequence.\nUI:N - The attacker performs every step on its own file descriptor with no action by any other user; the ocfs2 mount is a pre-existing property of the deployment, not an action the attacker must induce.\nS:U - The corruption and crash are confined to the kernel and the filesystem's own on-disk data within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale extent-map entry retains the old physical cluster, which is freed to the global bitmap by the truncate-log flush at the end of the move, so later reads (O_DIRECT or buffered after cache eviction) resolve through the stale mapping and return the contents of clusters the allocator has since handed to other users' or root-owned files.\nI:H - The same stale cpos\u2192old_phys mapping is used for writes and writeback, so attacker-controlled data lands on physical clusters now owned by a different file, giving arbitrary on-disk corruption of files the attacker has no write permission to.\nA:H - BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) at fs/ocfs2/refcounttree.c:2683 oopses the task while it holds inode_lock, ip_alloc_sem and the ocfs2 DLM inode lock, permanently wedging the filesystem and blocking other cluster nodes; with panic_on_oops it is a full system panic."
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}