CVE-2025-39887 (GCVE-0-2025-39887)
Vulnerability from cvelistv5
Published
2025-09-23 06:00
Modified
2025-09-29 06:01
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
Impacted products
Vendor Product Version
Linux Linux Version: 17f89102fe23d7389085a8820550df688f79888a
Version: 17f89102fe23d7389085a8820550df688f79888a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_osnoise.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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              "versionType": "git"
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          "product": "Linux",
          "programFiles": [
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "6.16"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "6.16.8",
              "versionType": "semver"
            },
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              "version": "6.17",
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            }
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      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.8",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
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          ]
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T06:01:48.722Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e33228a2cc7ff706ca88533464e8a3b525b961ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/c1628c00c4351dd0727ef7f670694f68d9e663d8"
        }
      ],
      "title": "tracing/osnoise: Fix null-ptr-deref in bitmap_parselist()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39887",
    "datePublished": "2025-09-23T06:00:53.648Z",
    "dateReserved": "2025-04-16T07:20:57.145Z",
    "dateUpdated": "2025-09-29T06:01:48.722Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39887\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-23T06:15:48.820\",\"lastModified\":\"2025-09-24T18:11:24.520\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/c1628c00c4351dd0727ef7f670694f68d9e663d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e33228a2cc7ff706ca88533464e8a3b525b961ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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