CVE-2026-89457

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.

EPSS

0.2% chance of exploitation in the next 30 days; higher than 7% of CVEs (scores of 2026-10-25)

Published

2026-09-11

Modified

2026-10-19

Record from

the NVD, synced 2026-10-19

References

• https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf
• https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5
• https://git.kernel.org/stable/c/4a042d8e5f34282577ece50515cea8bb1246914d
• https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9
• https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9

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