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 8
https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/4a042d8e5f34282577ece50515cea8bb1246914d
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/644b666c202cce12ccfcf9ded67089b18f4f7659
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/bd8b4572528f9604a13bf3c7c2a167f5cf222f72
416baaa9-dc9f-4396-8d5f-8c081fb06d67