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GHSA-94GP-P6V7-5M5Q

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89457"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:26Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-94gp-p6v7-5m5q",
  "modified": "2026-09-14T15:32:24Z",
  "published": "2026-09-11T21:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89457"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a042d8e5f34282577ece50515cea8bb1246914d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/644b666c202cce12ccfcf9ded67089b18f4f7659"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd8b4572528f9604a13bf3c7c2a167f5cf222f72"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-89457 (GCVE-0-2026-89457)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 11:59

Title

s390/dasd: Guard sysfs discipline callbacks against unallocated private data

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.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/644b666c202cce12c…
https://git.kernel.org/stable/c/4a042d8e5f3428257…
https://git.kernel.org/stable/c/bd8b4572528f9604a…
https://git.kernel.org/stable/c/57db27ccc162afe07…
https://git.kernel.org/stable/c/536407b272402af67…
https://git.kernel.org/stable/c/6452c13646af7c13d…
https://git.kernel.org/stable/c/449f3bada7a9fad8b…
https://git.kernel.org/stable/c/2a1780f9fc2493bd3…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c729696bcf8b23450043dd9c9972c15e53419ae4 , < 644b666c202cce12ccfcf9ded67089b18f4f7659 (git) Affected: c729696bcf8b23450043dd9c9972c15e53419ae4 , < 4a042d8e5f34282577ece50515cea8bb1246914d (git) Affected: c729696bcf8b23450043dd9c9972c15e53419ae4 , < bd8b4572528f9604a13bf3c7c2a167f5cf222f72 (git) Affected: c729696bcf8b23450043dd9c9972c15e53419ae4 , < 57db27ccc162afe0726cffec0ae62e410ed2d0e9 (git) Affected: c729696bcf8b23450043dd9c9972c15e53419ae4 , < 536407b272402af679155910d7fdeeb4834eefb9 (git) Affected: c729696bcf8b23450043dd9c9972c15e53419ae4 , < 6452c13646af7c13d7f6668b6690cfb2427e7f7b (git) Affected: c729696bcf8b23450043dd9c9972c15e53419ae4 , < 449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5 (git) Affected: c729696bcf8b23450043dd9c9972c15e53419ae4 , < 2a1780f9fc2493bd34c418a0be6fc58943afcecf (git)
Linux	Linux	Affected: 5.3 Unaffected: 0 , < 5.3 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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