{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-68337",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-68337"
  ],
  "published": "2025-12-22T16:14:44Z",
  "summary": "jbd2: avoid bug_on in jbd2_journal_get_create_access() when file system corrupted",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: avoid bug_on in jbd2_journal_get_create_access() when file system corrupted\n\nThere's issue when file system corrupted:\n------------[ cut here ]------------\nkernel BUG at fs/jbd2/transaction.c:1289!\nOops: invalid opcode: 0000 [#1] SMP KASAN PTI\nCPU: 5 UID: 0 PID: 2031 Comm: mkdir Not tainted 6.18.0-rc1-next\nRIP: 0010:jbd2_journal_get_create_access+0x3b6/0x4d0\nRSP: 0018:ffff888117aafa30 EFLAGS: 00010202\nRAX: 0000000000000000 RBX: ffff88811a86b000 RCX: ffffffff89a63534\nRDX: 1ffff110200ec602 RSI: 0000000000000004 RDI: ffff888100763010\nRBP: ffff888100763000 R08: 0000000000000001 R09: ffff888100763028\nR10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000\nR13: ffff88812c432000 R14: ffff88812c608000 R15: ffff888120bfc000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f91d6970c99 CR3: 00000001159c4000 CR4: 00000000000006f0\nCall Trace:\n <TASK>\n __ext4_journal_get_create_access+0x42/0x170\n ext4_getblk+0x319/0x6f0\n ext4_bread+0x11/0x100\n ext4_append+0x1e6/0x4a0\n ext4_init_new_dir+0x145/0x1d0\n ext4_mkdir+0x326/0x920\n vfs_mkdir+0x45c/0x740\n do_mkdirat+0x234/0x2f0\n __x64_sys_mkdir+0xd6/0x120\n do_syscall_64+0x5f/0xfa0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe above issue occurs with us in errors=continue mode when accompanied by\nstorage failures. There have been many inconsistencies in the file system\ndata.\nIn the case of file system data inconsistency, for example, if the block\nbitmap of a referenced block is not set, it can lead to the situation where\na block being committed is allocated and used again. As a result, the\nfollowing condition will not be satisfied then trigger BUG_ON. Of course,\nit is entirely possible to construct a problematic image that can trigger\nthis BUG_ON through specific operations. In fact, I have constructed such\nan image and easily reproduced this issue.\nTherefore, J_ASSERT() holds true only under ideal conditions, but it may\nnot necessarily be satisfied in exceptional scenarios. Using J_ASSERT()\ndirectly in abnormal situations would cause the system to crash, which is\nclearly not what we want. So here we directly trigger a JBD abort instead\nof immediately invoking BUG_ON.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-68337"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/71bbe06c40fc59b5b15661eca8ff307f4176d7f9"
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  "database_specific": {
    "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": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - A remote client can reach the vulnerable path through a guest-writable ksmbd share or permissive NFS export backed by corrupted ext4; SMB/NFS directory creation ultimately invokes ext4_mkdir().\nAC:L - Once the bitmap/journal inconsistency exists, directory creation deterministically reaches the assertion, and the commit author reports easily reproducing it with a constructed image.\nPR:N - A guest-writable SMB share or permissive NFS export can require no credentials, while the underlying mkdir path requires only directory write and search permission without capabilities.\nUI:N - The attacker directly issues the directory-creation request against an already-mounted filesystem, requiring no victim action during exploitation.\nS:U - The failure remains within the host kernel and filesystem security authority and does not cross a virtualization or sandbox boundary.\nC:N - The failed JBD2 invariant immediately executes BUG_ON without exposing memory or providing an out-of-bounds read primitive.\nI:N - The defect is an assertion-triggered crash, not memory corruption, and it provides no attacker-controlled write or code-execution primitive.\nA:H - BUG_ON raises an invalid-opcode kernel oops and can panic or reboot the system; the request can be repeated while the corrupted filesystem state persists."
    }
  }
}