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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89457
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:26 UTC
Updated2026-09-11 20:19:26 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.063410000 (date 2026-09-13)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c729696bcf8b23450043dd9c9972c15e53419ae4 536407b272402af679155910d7fdeeb4834eefb9 git Not specified
CNA Linux Linux affected c729696bcf8b23450043dd9c9972c15e53419ae4 6452c13646af7c13d7f6668b6690cfb2427e7f7b git Not specified
CNA Linux Linux affected c729696bcf8b23450043dd9c9972c15e53419ae4 449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5 git Not specified
CNA Linux Linux affected c729696bcf8b23450043dd9c9972c15e53419ae4 2a1780f9fc2493bd34c418a0be6fc58943afcecf git Not specified
CNA Linux Linux affected 5.3 Not specified
CNA Linux Linux unaffected 5.3 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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