{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43117",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43117"
  ],
  "published": "2026-05-06T07:41:37Z",
  "summary": "btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()\n\nIf overlay is used on top of btrfs, dentry->d_sb translates to overlay's\nsuper block and fsid assignment will lead to a crash.\n\nUse file_inode(file)->i_sb to always get btrfs_sb.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43117"
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      "scenario": "AV:N - The vulnerable tracepoint is reachable through fsync/flush paths, and a severe reasonable deployment is an NFS/ksmbd-exported overlay filesystem backed by btrfs where a remote client can issue COMMIT/FLUSH into btrfs_sync_file(). Local fsync paths also reach it, but the network file-server path is the highest reasonable vector.\nAC:L - Once the btrfs_sync_file tracepoint/perf event is active, triggering the bug is a deterministic fsync/flush on an overlay-backed btrfs file with no race or timing requirement. Overlay-on-btrfs is a normal supported configuration.\nPR:N - A remote client can plausibly reach the fsync path through a guest or writable NFS/SMB export without privileges on the vulnerable host. When uncertain, the higher severity no-privilege scenario is defensible.\nUI:N - No victim action is needed after the filesystem/export/tracing environment exists; the attacker only sends or performs the fsync/flush operation. Mounting or tracing setup is environmental, not per-exploit user interaction.\nS:U - The impact is within the same kernel security authority and does not cross a hypervisor, IOMMU, or sandbox boundary. Standard kernel crash or kernel-memory exposure remains scope unchanged.\nC:H - The bug type-confuses an overlay superblock as btrfs_fs_info and copies through the bogus fs_devices pointer into trace/perf data. If the pointer resolves to valid kernel memory, this can expose kernel memory, so the higher severity confidentiality impact is selected.\nI:N - The vulnerable operations are invalid reads and writes only to the trace record buffer, not attacker-controlled writes to kernel objects. No direct integrity modification or control-flow overwrite was found.\nA:H - The fix commit explicitly states the bad fsid assignment can crash, and the invalid superblock/fs_devices dereference can oops or panic the kernel. This is high availability impact."
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}