{
  "cveId": "CVE-2026-64426",
  "url": "https://patchblox.com/security/cve/CVE-2026-64426",
  "summary": "CVE-2026-64426 is fixed in 20 products on 1 platform, first by ALAS2023-2026-2045, released August 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  io_uring/nop: fix file reference leak with IOSQE...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  io_uring/nop: fix file reference leak with IOSQE_FIXED_FILE  NOP file-acquisition support choses between a fixed (registered) file and a normal fget()\u0027d file based on its own IORING_NOP_FIXED_FILE flag in sqe-\u003Enop_flags. However, a request\u0027s REQ_F_FIXED_FILE is set independently from the generic IOSQE_FIXED_FILE sqe flag during request init, before the issue handler runs.  If a NOP is submitted with IOSQE_FIXED_FILE set (so REQ_F_FIXED_FILE is set) but without IORING_NOP_FIXED_FILE, io_nop() takes the normal path and grabs a real reference via io_file_get_normal(). On completion, io_put_file() only drops the reference when REQ_F_FIXED_FILE is clear, so the fget()\u0027d file is never released and leaks:    BUG: memory leak   unreferenced object 0xffff88800f42c240 (size 176):     kmem_cache_alloc_noprof\u002B0x358/0x440     alloc_empty_file\u002B0x57/0x180     path_openat\u002B0x44/0x1e50     do_file_open\u002B0x121/0x200     do_sys_openat2\u002B0xa7/0x150     __x64_sys_openat\u002B0x82/0xf0  Decide between fixed and normal file acquisition from REQ_F_FIXED_FILE, the same way io_assign_file() does for every other opcode, and fold IORING_NOP_FIXED_FILE into REQ_F_FIXED_FILE at prep time.",
  "published": "2026-07-25T10:17:26Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.0016,
  "epssPercentile": 0.05199,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.18.39-79.141",
      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-headers",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra-common",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.4-1",
      "fix": "DEBIAN-CVE-2026-64426",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64426",
      "released": "2026-08-07T15:22:10Z"
    },
    {
      "platform": "linux",
      "product": "microvm-kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}