{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63816",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63816"
  ],
  "published": "2026-07-19T12:02:32Z",
  "summary": "f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode\n\n- ioctl(F2FS_IOC_GARBAGE_COLLECT_RANGE)\t\t- shrink\n - f2fs_gc\n  - gc_data_segment\n   - ra_data_block(cow_inode)\n    - mapping = F2FS_I(inode)->atomic_inode->i_mapping\n    : f2fs_is_cow_file(cow_inode) is true\n\t\t\t\t\t\t - f2fs_evict_inode(atomic_inode)\n\t\t\t\t\t\t  - clear_inode_flag(fi->cow_inode, FI_COW_FILE)\n\t\t\t\t\t\t  - F2FS_I(fi->cow_inode)->atomic_inode = NULL\n\t\t\t\t\t\t  ...\n\t\t\t\t\t\t  - truncate_inode_pages_final(atomic_inode)\n    - f2fs_grab_cache_folio(mapping)\n    : create folio in atomic_inode->mapping\n\t\t\t\t\t\t  - clear_inode(atomic_inode)\n\t\t\t\t\t\t   - BUG_ON(atomic_inode->i_data.nrpages)\n\nWe need to add a reference on fi->atomic_inode before using its mapping\nfield during garbage collection, otherwise, it will cause UAF issue.",
  "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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    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local access through filesystem syscalls and ioctls (atomic-write ioctls, file I/O, close/evict) on an F2FS mount; there is no network-facing entry point to the vulnerable GC path.\nAC:L - The attacker controls both sides of the race by running concurrent threads that perform atomic writes/commits/closes while filling the filesystem or driving writes to trigger background or foreground GC via f2fs_balance_fs and the f2fs_gc kthread.\nPR:L - No real root is required; an unprivileged local user with write access to their own files on F2FS can use atomic-write ioctls and normal I/O to reach the bug, while GC runs automatically without CAP_SYS_ADMIN.\nUI:N - The attacker can trigger the full exploit chain on files they own without any separate victim user performing actions; atomic-write setup, GC pressure, and inode eviction are all orchestrated by the attacker process.\nS:U - Impact is kernel memory corruption and potential local privilege escalation within the same kernel security boundary, not a cross-VM or cross-container escape to a different security authority.\nC:H - This is a use-after-free on a live inode address_space; the freed atomic_inode can be reused or read through stale mapping pointers, enabling arbitrary kernel memory disclosure primitives.\nI:H - UAF on inode mapping during folio allocation allows heap corruption and control of freed object contents, which is exploitable for arbitrary kernel write and local privilege escalation.\nA:H - The race reliably leads to kernel BUG_ON in clear_inode when nrpages is nonzero, and UAF corruption can cause kernel oops or panic even before full exploitation."
    }
  }
}