{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-21699",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-21699"
  ],
  "published": "2025-02-12T13:52:50Z",
  "summary": "gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Truncate address space when flipping GFS2_DIF_JDATA flag\n\nTruncate an inode's address space when flipping the GFS2_DIF_JDATA flag:\ndepending on that flag, the pages in the address space will either use\nbuffer heads or iomap_folio_state structs, and we cannot mix the two.",
  "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-2025-21699"
    },
    {
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      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is reached through the local ioctl(FS_IOC_SETFLAGS) syscall path (ioctl_setflags \u2192 vfs_fileattr_set \u2192 gfs2_fileattr_set \u2192 do_gfs2_set_flags) on a file residing on a mounted GFS2 filesystem. No network-facing code path processes attacker data here.\nAC:L - Exploitation is fully deterministic and single-threaded: populate the page cache by writing to a file, flip GFS2_DIF_JDATA with chattr, then touch/truncate/fadvise the file to drive the mismatched aops over the stale folio->private. There is no race to win and no memory-layout precondition outside the attacker's control.\nPR:L - The only access control on the path is inode_owner_or_capable(), so any unprivileged local user who owns a file on the GFS2 mount can flip the flag; fileattr_set_prepare() restricts only APPEND/IMMUTABLE and project IDs, not FS_JOURNAL_DATA_FL. GFS2 is deployed as admin-mounted shared cluster/HPC storage where ordinary users routinely own files.\nUI:N - The attacker performs every step themselves (create file, write, chattr, re-access) with no action by any other user. The GFS2 filesystem is already mounted as part of normal operation in the target deployment.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed. This is a standard local kernel privilege-escalation scope.\nC:H - The type confusion yields out-of-bounds reads past the ~24-byte iomap_folio_state (b_size/b_data/b_end_io read from adjacent slab objects) and leaks buffer_head pointer contents through ifs->state bitmap reads, plus a use-after-free on buffer_head that gives the attacker control of freed-object contents and thus an arbitrary-read primitive.\nI:H - ifs_free() calls kfree() on a live buffer_head still linked into the bh ring, bh_lru and b_assoc_buffers lists, producing a UAF with list-unlink write primitives; bitmap_set()/atomic_add() write directly into b_folio/b_blocknr/b_this_page, and in the opposite direction an OOB-read b_data is used as a memcpy destination for user-controlled data while b_end_io is called as a function pointer.\nA:H - spin_lock_irqsave() on ifs->state_lock aliased onto a non-zero bh->b_state spins forever with interrupts disabled, causing a hard lockup, and the corrupted b_this_page/b_folio pointers plus the buffer_head UAF reliably produce oopses and panics."
    }
  }
}