s390/dasd: Guard sysfs discipline callbacks against unallocated private data
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.
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
- Added to Heist Feed
- Publisher date