CVE-2026-89457

CVE-2026-89457: vulnerability in Linux

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

Published · Updated

3Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 0.2%
exploitation probability
0.2%top 93% of all CVEs
observed exploitation
nono source reports it
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.
Affected products
Linux · Linux
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References
https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecfhttps://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5https://git.kernel.org/stable/c/4a042d8e5f34282577ece50515cea8bb1246914dhttps://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9https://git.kernel.org/stable/c/644b666c202cce12ccfcf9ded67089b18f4f7659https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7bhttps://git.kernel.org/stable/c/bd8b4572528f9604a13bf3c7c2a167f5cf222f72