{
  "cveId": "CVE-2025-39887",
  "url": "https://patchblox.com/security/cve/CVE-2025-39887",
  "summary": "CVE-2025-39887 is fixed in linux on 1 platform by DEBIAN-CVE-2025-39887 (version 6.16.8-1), released September 23, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  tracing/osnoise: Fix null-ptr-deref in bitmap_pa...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  tracing/osnoise: Fix null-ptr-deref in bitmap_parselist()  A crash was observed with the following output:  BUG: kernel NULL pointer dereference, address: 0000000000000010 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 2 UID: 0 PID: 92 Comm: osnoise_cpus Not tainted 6.17.0-rc4-00201-gd69eb204c255 #138 PREEMPT(voluntary) RIP: 0010:bitmap_parselist\u002B0x53/0x3e0 Call Trace:  \u003CTASK\u003E  osnoise_cpus_write\u002B0x7a/0x190  vfs_write\u002B0xf8/0x410  ? do_sys_openat2\u002B0x88/0xd0  ksys_write\u002B0x60/0xd0  do_syscall_64\u002B0xa4/0x260  entry_SYSCALL_64_after_hwframe\u002B0x77/0x7f  \u003C/TASK\u003E  This issue can be reproduced by below code:  fd=open(\u0022/sys/kernel/debug/tracing/osnoise/cpus\u0022, O_WRONLY); write(fd, \u00220-2\u0022, 0);  When user pass \u0027count=0\u0027 to osnoise_cpus_write(), kmalloc() will return ZERO_SIZE_PTR (16) and cpulist_parse() treat it as a normal value, which trigger the null pointer dereference. Add check for the parameter \u0027count\u0027.",
  "published": "2025-09-23T06:15:48Z",
  "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": 0.0013,
  "epssPercentile": 0.02676,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.16.8-1",
      "fix": "DEBIAN-CVE-2025-39887",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39887",
      "released": "2025-09-23T06:15:48Z"
    }
  ],
  "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"
  }
}