UNKNOWN NVD
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
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.
References
- https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf
- https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5
- https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9
- https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b
This unknown severity vulnerability was published on 2026-09-11 via NVD.
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