{
  "cveId": "CVE-2023-52982",
  "url": "https://patchblox.com/security/cve/CVE-2023-52982",
  "summary": "CVE-2023-52982 is fixed in 20 products on 1 platform, first by ALAS2023-2023-132, released March 11, 2023. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  fscache: Use wait_on_bit() to wait for the freei...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  fscache: Use wait_on_bit() to wait for the freeing of relinquished volume  The freeing of relinquished volume will wake up the pending volume acquisition by using wake_up_bit(), however it is mismatched with wait_var_event() used in fscache_wait_on_volume_collision() and it will never wake up the waiter in the wait-queue because these two functions operate on different wait-queues.  According to the implementation in fscache_wait_on_volume_collision(), if the wake-up of pending acquisition is delayed longer than 20 seconds (e.g., due to the delay of on-demand fd closing), the first wait_var_event_timeout() will timeout and the following wait_var_event() will hang forever as shown below:   FS-Cache: Potential volume collision new=00000024 old=00000022  ......  INFO: task mount:1148 blocked for more than 122 seconds.        Not tainted 6.1.0-rc6\u002B #1  task:mount           state:D stack:0     pid:1148  ppid:1  Call Trace:   \u003CTASK\u003E   __schedule\u002B0x2f6/0xb80   schedule\u002B0x67/0xe0   fscache_wait_on_volume_collision.cold\u002B0x80/0x82   __fscache_acquire_volume\u002B0x40d/0x4e0   erofs_fscache_register_volume\u002B0x51/0xe0 [erofs]   erofs_fscache_register_fs\u002B0x19c/0x240 [erofs]   erofs_fc_fill_super\u002B0x746/0xaf0 [erofs]   vfs_get_super\u002B0x7d/0x100   get_tree_nodev\u002B0x16/0x20   erofs_fc_get_tree\u002B0x20/0x30 [erofs]   vfs_get_tree\u002B0x24/0xb0   path_mount\u002B0x2fa/0xa90   do_mount\u002B0x7c/0xa0   __x64_sys_mount\u002B0x8b/0xe0   do_syscall_64\u002B0x30/0x60   entry_SYSCALL_64_after_hwframe\u002B0x46/0xb0  Considering that wake_up_bit() is more selective, so fix it by using wait_on_bit() instead of wait_var_event() to wait for the freeing of relinquished volume. In addition because waitqueue_active() is used in wake_up_bit() and clear_bit() doesn\u0027t imply any memory barrier, use clear_and_wake_up_bit() to add the missing memory barrier between cursor-\u003Eflags and waitqueue_active().",
  "published": "2023-03-11T01:10:00Z",
  "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": 0.00228,
  "epssPercentile": 0.13697,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-devel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-headers",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-libbpf",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-libbpf-devel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-libbpf-static",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.1.12-17.42",
      "release": "amzn 2023",
      "fixedVersion": "1.0-0.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-tools",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.11-1",
      "fix": "DEBIAN-CVE-2023-52982",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-52982",
      "released": "2025-03-27T17:15:45Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.1.11-1",
      "fix": "DEBIAN-CVE-2023-52982",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-52982",
      "released": "2025-03-27T17:15:45Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.1.11-1",
      "fix": "DEBIAN-CVE-2023-52982",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-52982",
      "released": "2025-03-27T17:15:45Z"
    },
    {
      "platform": "linux",
      "product": "perf",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "perf-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.12-17.42.amzn2023",
      "fix": "ALAS2023-2023-132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-132",
      "released": "2023-03-11T01:10:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}