CVE-2026-72025 (GCVE-0-2026-72025)
Vulnerability from cvelistv5
Published
2026-08-15 05:51
Modified
2026-08-18 06:56
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/monwriter: Reject buffer reuse with different data length When data buffers are reused, e.g. for interval sample records, the first record determines the data length, and the size of the buffer for user copy. Current monwriter code does not check if the data length was changed for subsequent records, which also would never happen for valid user programs. However, a malicious user could change the data length, resulting in out of bounds user copy to the kernel buffer, and memory corruption. By default, the monwriter misc device is created with root-only permissions, so practical impact is typically low. Fix this by checking for changed data length and rejecting such records.
References
Impacted products
Vendor Product Version
Linux Linux Version: 31b58088292c7f00f0b81088bfb557285b0b6247
Version: 31b58088292c7f00f0b81088bfb557285b0b6247
Version: 31b58088292c7f00f0b81088bfb557285b0b6247
Version: 31b58088292c7f00f0b81088bfb557285b0b6247
Version: 31b58088292c7f00f0b81088bfb557285b0b6247
Version: 31b58088292c7f00f0b81088bfb557285b0b6247
Version: 31b58088292c7f00f0b81088bfb557285b0b6247
Version: 31b58088292c7f00f0b81088bfb557285b0b6247
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/monwriter: Reject buffer reuse with different data length\n\nWhen data buffers are reused, e.g. for interval sample records, the\nfirst record determines the data length, and the size of the buffer for\nuser copy. Current monwriter code does not check if the data length was\nchanged for subsequent records, which also would never happen for valid\nuser programs.\n\nHowever, a malicious user could change the data length, resulting in out\nof bounds user copy to the kernel buffer, and memory corruption. By\ndefault, the monwriter misc device is created with root-only permissions,\nso practical impact is typically low.\n\nFix this by checking for changed data length and rejecting such records."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T06:56:09.214Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/d39cf4a6d721b1ae21eb53bbf3e8cd984253d7ab"
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        {
          "url": "https://git.kernel.org/stable/c/2995ccec260caa9e85b3301a4aba1e66ed80ad74"
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      "title": "s390/monwriter: Reject buffer reuse with different data length",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72025",
    "datePublished": "2026-08-15T05:51:49.928Z",
    "dateReserved": "2026-08-09T03:40:39.900Z",
    "dateUpdated": "2026-08-18T06:56:09.214Z",
    "state": "PUBLISHED"
  },
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}


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