{
  "cveId": "CVE-2025-39745",
  "url": "https://patchblox.com/security/cve/CVE-2025-39745",
  "summary": "CVE-2025-39745 is fixed in linux on 1 platform by DEBIAN-CVE-2025-39745 (version 6.16.3-1), released September 11, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "rcutorture: Fix rcutorture_one_extend_check() splat in RT kernels",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  rcutorture: Fix rcutorture_one_extend_check() splat in RT kernels  For built with CONFIG_PREEMPT_RT=y kernels, running rcutorture tests resulted in the following splat:  [   68.797425] rcutorture_one_extend_check during change: Current 0x1  To add 0x1  To remove 0x0  preempt_count() 0x0 [   68.797533] WARNING: CPU: 2 PID: 512 at kernel/rcu/rcutorture.c:1993 rcutorture_one_extend_check\u002B0x419/0x560 [rcutorture] [   68.797601] Call Trace: [   68.797602]  \u003CTASK\u003E [   68.797619]  ? lockdep_softirqs_off\u002B0xa5/0x160 [   68.797631]  rcutorture_one_extend\u002B0x18e/0xcc0 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c] [   68.797646]  ? local_clock\u002B0x19/0x40 [   68.797659]  rcu_torture_one_read\u002B0xf0/0x280 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c] [   68.797678]  ? __pfx_rcu_torture_one_read\u002B0x10/0x10 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c] [   68.797804]  ? __pfx_rcu_torture_timer\u002B0x10/0x10 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c] [   68.797815] rcu-torture: rcu_torture_reader task started [   68.797824] rcu-torture: Creating rcu_torture_reader task [   68.797824]  rcu_torture_reader\u002B0x238/0x580 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c] [   68.797836]  ? kvm_sched_clock_read\u002B0x15/0x30  Disable BH does not change the SOFTIRQ corresponding bits in preempt_count() for RT kernels, this commit therefore use softirq_count() to check the if BH is disabled.",
  "published": "2025-09-11T17:15:37Z",
  "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": 0.00157,
  "epssPercentile": 0.04903,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39745",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.16.3-1",
      "fix": "DEBIAN-CVE-2025-39745",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39745",
      "released": "2025-09-11T17:15:37Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}