Not yet scoredPublished Sep 11, 2026

CVE-2026-89457s390/dasd: Guard sysfs discipline callbacks against unallocated private data

Updated under an hour ago (Oct 26, 2026, 9:40 PM ET)

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Exploited in the last 30 days

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.

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from c729696bcf8b23450043dd9c9972c15e53419ae4 before 644b666c202cce12ccfcf9ded67089b18f4f7659; from c729696bcf8b23450043dd9c9972c15e53419ae4 before 4a042d8e5f34282577ece50515cea8bb1246914d; from c729696bcf8b23450043dd9c9972c15e53419ae4 before bd8b4572528f9604a13bf3c7c2a167f5cf222f72; from c729696bcf8b23450043dd9c9972c15e53419ae4 before 57db27ccc162afe0726cffec0ae62e410ed2d0e9; from c729696bcf8b23450043dd9c9972c15e53419ae4 before 536407b272402af679155910d7fdeeb4834eefb9; from c729696bcf8b23450043dd9c9972c15e53419ae4 before 6452c13646af7c13d7f6668b6690cfb2427e7f7b; from c729696bcf8b23450043dd9c9972c15e53419ae4 before 449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5; from c729696bcf8b23450043dd9c9972c15e53419ae4 before 2a1780f9fc2493bd34c418a0be6fc58943afcecf	CNA record

References

References

https://git.kernel.org/stable/c/644b666c202cce12ccfcf9ded67089b18f4f7659
https://git.kernel.org/stable/c/4a042d8e5f34282577ece50515cea8bb1246914d
https://git.kernel.org/stable/c/bd8b4572528f9604a13bf3c7c2a167f5cf222f72
https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9
https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9
https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b
https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5
https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.