{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63819",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63819"
  ],
  "published": "2026-07-19T12:02:32Z",
  "summary": "f2fs: fix to do sanity check on f2fs_get_node_folio_ra()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on f2fs_get_node_folio_ra()\n\nkernel BUG at fs/f2fs/file.c:845!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nCPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nRIP: 0010:f2fs_do_truncate_blocks+0x1115/0x1140 fs/f2fs/file.c:845\nCode: fc fc 90 0f 0b e8 8b 9d 9a fd 90 0f 0b e8 83 9d 9a fd 48 89 df 48 c7 c6 60 d1 1a 8c e8 54 f1 fc fc 90 0f 0b e8 6c 9d 9a fd 90 <0f> 0b e8 64 9d 9a fd 90 0f 0b 90 e9 93 fd ff ff e8 56 9d 9a fd 90\nRSP: 0018:ffffc9000e4474c0 EFLAGS: 00010283\nRAX: ffffffff842b1d34 RBX: 0000000000000003 RCX: 0000000000100000\nRDX: ffffc9000f03a000 RSI: 0000000000035503 RDI: 0000000000035504\nRBP: ffffc9000e447608 R08: ffff8880123b0000 R09: 0000000000000002\nR10: 00000000fffffffe R11: 0000000000000002 R12: 0000000000000001\nR13: 0000000000000000 R14: 1ffff92001c88ea0 R15: 00000000ffff039c\nFS:  00007f7e02ee36c0(0000) GS:ffff88808c887000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007ff0305c4000 CR3: 0000000012d4c000 CR4: 0000000000352ef0\nCall Trace:\n <TASK>\n f2fs_truncate_blocks+0x10a/0x300 fs/f2fs/file.c:882\n f2fs_truncate+0x471/0x7c0 fs/f2fs/file.c:940\n f2fs_evict_inode+0xa3f/0x1ac0 fs/f2fs/inode.c:907\n evict+0x61e/0xb10 fs/inode.c:841\n f2fs_fill_super+0x5f43/0x78f0 fs/f2fs/super.c:5224\n get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694\n vfs_get_tree+0x92/0x2a0 fs/super.c:1754\n fc_mount fs/namespace.c:1193 [inline]\n do_new_mount_fc fs/namespace.c:3758 [inline]\n do_new_mount+0x341/0xd30 fs/namespace.c:3834\n do_mount fs/namespace.c:4167 [inline]\n __do_sys_mount fs/namespace.c:4383 [inline]\n __se_sys_mount+0x31d/0x420 fs/namespace.c:4360\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n\tcount = ADDRS_PER_PAGE(dn.node_folio, inode);\n\n\tcount -= dn.ofs_in_node;\n\tf2fs_bug_on(sbi, count < 0);\n\nThe fuzz test will trigger above bug_on in f2fs.\n\nThe root cause should be: in the corrupted inode, there is a direct node\nwhich has the same ino and nid in its footer, so in f2fs_do_truncate_blocks(),\nafter f2fs_get_dnode_of_data() finds such dnode:\n1) ADDRS_PER_PAGE(dn.node_folio, inode) will return 923\n2) once dn.ofs_in_node points to addr[923, 1017]\nThen it will trigger the system panic.\n\nLet's introduce NODE_TYPE_NON_IXNODE to indicate current node should\nnot be an inode or xattr node, and then use it in below path to detect\ninconsistent node chain in inode mapping table:\n\n- f2fs_do_truncate_blocks\n - f2fs_get_dnode_of_data\n  - f2fs_get_node_folio_ra\n   -  __get_node_folio\n    - f2fs_sanity_check_node_footer\n     - case NODE_TYPE_NON_IXNODE -> check whether it is inode|xnode",
  "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-2026-63819"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/406c28af75123432d38cf9bbaa6f1476f7b14770"
    },
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      "url": "https://git.kernel.org/stable/c/0cc21c1ffe15b4156b0bf744f32fd1faef0b7c73"
    },
    {
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      "url": "https://git.kernel.org/stable/c/8712353ed80f87271d732297567dcdbe4b84e8c7"
    }
  ],
  "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 vulnerable F2FS code is reached only through local VFS syscalls (mount, fallocate, unlink/truncate) processing on-disk node metadata; there is no network-facing handler in this path.\nAC:L - Syzkaller reliably triggers this with a crafted F2FS image; the attacker fully controls the corrupted node footer and needs no races or special timing beyond presenting the malformed metadata.\nPR:L - While mounting F2FS requires elevated privileges, the same vulnerable truncate path is reachable from unprivileged local syscalls (fallocate, unlink) on an already-mounted crafted filesystem, matching the CVE-2025-40025 attack class on F2FS-equipped systems like Android phones.\nUI:N - Exploitation requires no victim interaction beyond the attacker (or system policy) mounting or accessing the crafted filesystem; no additional user actions are needed to trigger the panic.\nS:U - The impact is a kernel panic and filesystem-metadata mishandling within the same kernel security domain; it does not cross VM, container, or IOMMU boundaries.\nC:H - Misidentifying a direct node as an inode causes the kernel to use the wrong address layout (i_addr vs dn.addr) when reading block pointers from attacker-controlled node pages, enabling out-of-bounds reads within the node folio that can leak adjacent metadata.\nI:H - The same node-type confusion can cause truncate operations to write block addresses through the wrong structure layout on cached node pages, corrupting kernel metadata in ways that could be further exploited beyond the immediate crash.\nA:H - The bug triggers f2fs_bug_on() with a negative block count, producing a demonstrated kernel BUG/panic (Oops) in the syzkaller reproducer; even without CONFIG_F2FS_CHECK_FS this causes a WARN and filesystem error handling that degrades availability."
    }
  }
}