{
  "cveId": "CVE-2026-43127",
  "url": "https://patchblox.com/security/cve/CVE-2026-43127",
  "summary": "CVE-2026-43127 is fixed in 23 products on 1 platform, first by ALAS2023-2026-1702, released May 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "ntfs3: fix circular locking dependency in run_unpack_ex",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ntfs3: fix circular locking dependency in run_unpack_ex  Syzbot reported a circular locking dependency between wnd-\u003Erw_lock (sbi-\u003Eused.bitmap) and ni-\u003Efile.run_lock.  The deadlock scenario: 1. ntfs_extend_mft() takes ni-\u003Efile.run_lock then wnd-\u003Erw_lock. 2. run_unpack_ex() takes wnd-\u003Erw_lock then tries to acquire    ni-\u003Efile.run_lock inside ntfs_refresh_zone().  This creates an AB-BA deadlock.  Fix this by using down_read_trylock() instead of down_read() when acquiring run_lock in run_unpack_ex(). If the lock is contended, skip ntfs_refresh_zone() - the MFT zone will be refreshed on the next MFT operation. This breaks the circular dependency since we never block waiting for run_lock while holding wnd-\u003Erw_lock.",
  "published": "2026-05-06T12:16:29Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Improper Locking",
  "epss": 0.0012,
  "epssPercentile": 0.01809,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43127",
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.18.16-18.222",
      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-headers",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-libbpf",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-libbpf-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-libbpf-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-libbpf-static",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra-common",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-43127",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43127",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.19.6-1",
      "fix": "DEBIAN-CVE-2026-43127",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43127",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.16-18.222.amzn2023",
      "fix": "ALAS2023-2026-1702",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1702",
      "released": "2026-05-11T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}