CVE-2026-89457
Full vulnerability record from the local CVENow database.
Description
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
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-11 20:19:26.527000
Last modified
2026-10-19 09:17:38.037000
View original CVE JSON
{
"id": "CVE-2026-89457",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-11T20:19:26.527",
"lastModified": "2026-10-19T09:17:38.037",
"vulnStatus": "Received",
"cveTags": [],
"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->private, either directly or through the\nDASD_DEFINE_ATTR() macro. During dasd_generic_set_online() the discipline\nis assigned before check_device() allocates device->private, 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->private."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/s390/block/dasd_eckd.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"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",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/s390/block/dasd_eckd.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.3",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.3",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.270",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.221",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.109",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.50",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.4",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4a042d8e5f34282577ece50515cea8bb1246914d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/644b666c202cce12ccfcf9ded67089b18f4f7659",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/bd8b4572528f9604a13bf3c7c2a167f5cf222f72",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}