CVE-2026-89457 (GCVE-0-2026-89457)
Vulnerability from cvelistv5
Published
2026-09-11 19:43
Modified
2026-10-19 08:47
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/dasd: Guard sysfs discipline callbacks against unallocated private data Several sysfs show/store handlers call a discipline callback that dereferences device->private, either directly or through the DASD_DEFINE_ATTR() macro. During dasd_generic_set_online() the discipline is assigned before check_device() allocates device->private, so an unprivileged read of one of these world-readable attributes in that window dereferences a NULL pointer and panics. Guard the dereference inside each callback that actually touches device->private.
References
Impacted products
Vendor Product Version
Linux Linux Version: c729696bcf8b23450043dd9c9972c15e53419ae4
Version: c729696bcf8b23450043dd9c9972c15e53419ae4
Version: c729696bcf8b23450043dd9c9972c15e53419ae4
Version: c729696bcf8b23450043dd9c9972c15e53419ae4
Version: c729696bcf8b23450043dd9c9972c15e53419ae4
Version: c729696bcf8b23450043dd9c9972c15e53419ae4
Version: c729696bcf8b23450043dd9c9972c15e53419ae4
Version: c729696bcf8b23450043dd9c9972c15e53419ae4
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dasd: Guard sysfs discipline callbacks against unallocated private data\n\nSeveral sysfs show/store handlers call a discipline callback that\ndereferences device-\u003eprivate, either directly or through the\nDASD_DEFINE_ATTR() macro. During dasd_generic_set_online() the discipline\nis assigned before check_device() allocates device-\u003eprivate, so an\nunprivileged read of one of these world-readable attributes in that window\ndereferences a NULL pointer and panics.\n\nGuard the dereference inside each callback that actually touches\ndevice-\u003eprivate."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:47:06.711Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9"
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          "url": "https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89457",
    "datePublished": "2026-09-11T19:43:20.701Z",
    "dateReserved": "2026-09-11T19:38:34.707Z",
    "dateUpdated": "2026-10-19T08:47:06.711Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}


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