{
  "cveId": "CVE-2025-39731",
  "url": "https://patchblox.com/security/cve/CVE-2025-39731",
  "summary": "CVE-2025-39731 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-39731, released September 7, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "f2fs: vm_unmap_ram() may be called from an invalid context",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  f2fs: vm_unmap_ram() may be called from an invalid context  When testing F2FS with xfstests using UFS backed virtual disks the kernel complains sometimes that f2fs_release_decomp_mem() calls vm_unmap_ram() from an invalid context. Example trace from f2fs/007 test:  f2fs/007 5s ...  [12:59:38][    8.902525] run fstests f2fs/007 [   11.468026] BUG: sleeping function called from invalid context at mm/vmalloc.c:2978 [   11.471849] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 68, name: irq/22-ufshcd [   11.475357] preempt_count: 1, expected: 0 [   11.476970] RCU nest depth: 0, expected: 0 [   11.478531] CPU: 0 UID: 0 PID: 68 Comm: irq/22-ufshcd Tainted: G        W           6.16.0-rc5-xfstests-ufs-g40f92e79b0aa #9 PREEMPT(none) [   11.478535] Tainted: [W]=WARN [   11.478536] Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [   11.478537] Call Trace: [   11.478543]  \u003CTASK\u003E [   11.478545]  dump_stack_lvl\u002B0x4e/0x70 [   11.478554]  __might_resched.cold\u002B0xaf/0xbe [   11.478557]  vm_unmap_ram\u002B0x21/0xb0 [   11.478560]  f2fs_release_decomp_mem\u002B0x59/0x80 [   11.478563]  f2fs_free_dic\u002B0x18/0x1a0 [   11.478565]  f2fs_finish_read_bio\u002B0xd7/0x290 [   11.478570]  blk_update_request\u002B0xec/0x3b0 [   11.478574]  ? sbitmap_queue_clear\u002B0x3b/0x60 [   11.478576]  scsi_end_request\u002B0x27/0x1a0 [   11.478582]  scsi_io_completion\u002B0x40/0x300 [   11.478583]  ufshcd_mcq_poll_cqe_lock\u002B0xa3/0xe0 [   11.478588]  ufshcd_sl_intr\u002B0x194/0x1f0 [   11.478592]  ufshcd_threaded_intr\u002B0x68/0xb0 [   11.478594]  ? __pfx_irq_thread_fn\u002B0x10/0x10 [   11.478599]  irq_thread_fn\u002B0x20/0x60 [   11.478602]  ? __pfx_irq_thread_fn\u002B0x10/0x10 [   11.478603]  irq_thread\u002B0xb9/0x180 [   11.478605]  ? __pfx_irq_thread_dtor\u002B0x10/0x10 [   11.478607]  ? __pfx_irq_thread\u002B0x10/0x10 [   11.478609]  kthread\u002B0x10a/0x230 [   11.478614]  ? __pfx_kthread\u002B0x10/0x10 [   11.478615]  ret_from_fork\u002B0x7e/0xd0 [   11.478619]  ? __pfx_kthread\u002B0x10/0x10 [   11.478621]  ret_from_fork_asm\u002B0x1a/0x30 [   11.478623]  \u003C/TASK\u003E  This patch modifies in_task() check inside f2fs_read_end_io() to also check if interrupts are disabled. This ensures that pages are unmapped asynchronously in an interrupt handler.",
  "published": "2025-09-07T16:15:48Z",
  "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": 0.00155,
  "epssPercentile": 0.04631,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39731",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.148-1",
      "fix": "DEBIAN-CVE-2025-39731",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39731",
      "released": "2025-09-07T16:15:48Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.43-1",
      "fix": "DEBIAN-CVE-2025-39731",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39731",
      "released": "2025-09-07T16:15:48Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.16.3-1",
      "fix": "DEBIAN-CVE-2025-39731",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39731",
      "released": "2025-09-07T16:15:48Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}