fkie_cve-2025-39887
Vulnerability from fkie_nvd
Published
2025-09-23 06:15
Modified
2025-09-24 18:11
Severity ?
Summary
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+0x53/0x3e0 Call Trace: <TASK> osnoise_cpus_write+0x7a/0x190 vfs_write+0xf8/0x410 ? do_sys_openat2+0x88/0xd0 ksys_write+0x60/0xd0 do_syscall_64+0xa4/0x260 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> This issue can be reproduced by below code: fd=open("/sys/kernel/debug/tracing/osnoise/cpus", O_WRONLY); write(fd, "0-2", 0); When user pass 'count=0' 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 'count'.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1628c00c4351dd0727ef7f670694f68d9e663d8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e33228a2cc7ff706ca88533464e8a3b525b961ed
Impacted products
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/osnoise: Fix null-ptr-deref in bitmap_parselist()\n\nA crash was observed with the following output:\n\nBUG: kernel NULL pointer dereference, address: 0000000000000010\nOops: Oops: 0000 [#1] SMP NOPTI\nCPU: 2 UID: 0 PID: 92 Comm: osnoise_cpus Not tainted 6.17.0-rc4-00201-gd69eb204c255 #138 PREEMPT(voluntary)\nRIP: 0010:bitmap_parselist+0x53/0x3e0\nCall Trace:\n \u003cTASK\u003e\n osnoise_cpus_write+0x7a/0x190\n vfs_write+0xf8/0x410\n ? do_sys_openat2+0x88/0xd0\n ksys_write+0x60/0xd0\n do_syscall_64+0xa4/0x260\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \u003c/TASK\u003e\n\nThis issue can be reproduced by below code:\n\nfd=open(\"/sys/kernel/debug/tracing/osnoise/cpus\", O_WRONLY);\nwrite(fd, \"0-2\", 0);\n\nWhen user pass \u0027count=0\u0027 to osnoise_cpus_write(), kmalloc() will return\nZERO_SIZE_PTR (16) and cpulist_parse() treat it as a normal value, which\ntrigger the null pointer dereference. Add check for the parameter \u0027count\u0027."
    }
  ],
  "id": "CVE-2025-39887",
  "lastModified": "2025-09-24T18:11:24.520",
  "metrics": {},
  "published": "2025-09-23T06:15:48.820",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c1628c00c4351dd0727ef7f670694f68d9e663d8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e33228a2cc7ff706ca88533464e8a3b525b961ed"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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