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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-89457

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89457

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "c729696bcf8b23450043dd9c9972c15e53419ae4",
        "lessThan": "644b666c202cce12ccfcf9ded67089b18f4f7659",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c729696bcf8b23450043dd9c9972c15e53419ae4",
        "lessThan": "4a042d8e5f34282577ece50515cea8bb1246914d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c729696bcf8b23450043dd9c9972c15e53419ae4",
        "lessThan": "bd8b4572528f9604a13bf3c7c2a167f5cf222f72",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c729696bcf8b23450043dd9c9972c15e53419ae4",
        "lessThan": "57db27ccc162afe0726cffec0ae62e410ed2d0e9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c729696bcf8b23450043dd9c9972c15e53419ae4",
        "lessThan": "536407b272402af679155910d7fdeeb4834eefb9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c729696bcf8b23450043dd9c9972c15e53419ae4",
        "lessThan": "6452c13646af7c13d7f6668b6690cfb2427e7f7b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c729696bcf8b23450043dd9c9972c15e53419ae4",
        "lessThan": "449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c729696bcf8b23450043dd9c9972c15e53419ae4",
        "lessThan": "2a1780f9fc2493bd34c418a0be6fc58943afcecf",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/s390/block/dasd_eckd.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.3"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.3",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/s390/block/dasd_eckd.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89457

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#34989 · Revision 1
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Publisher date
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