CVE-2026-89457
Description
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.
How to fix
- Linux Linux644b666c202cce12ccfcf9ded67089b18f4f7659, 4a042d8e5f34282577ece50515cea8bb1246914d, bd8b4572528f9604a13bf3c7c2a167f5cf222f72, 57db27ccc162afe0726cffec0ae62e410ed2d0e9, 536407b272402af679155910d7fdeeb4834eefb9, 6452c13646af7c13d7f6668b6690cfb2427e7f7b, 449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5, 2a1780f9fc2493bd34c418a0be6fc58943afcecf or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | c729696bcf8b23450043dd9c9972c15e53419ae4 ≤ v < 644b666c202cce12ccfcf9ded67089b18f4f7659, c729696bcf8b23450043dd9c9972c15e53419ae4 ≤ v < 4a042d8e5f34282577ece50515cea8bb1246914d, c729696bcf8b23450043dd9c9972c15e53419ae4 ≤ v < bd8b4572528f9604a13bf3c7c2a167f5cf222f72, c729696bcf8b23450043dd9c9972c15e53419ae4 ≤ v < 57db27ccc162afe0726cffec0ae62e410ed2d0e9, c729696bcf8b23450043dd9c9972c15e53419ae4 ≤ v < 536407b272402af679155910d7fdeeb4834eefb9, c729696bcf8b23450043dd9c9972c15e53419ae4 ≤ v < 6452c13646af7c13d7f6668b6690cfb2427e7f7b, c729696bcf8b23450043dd9c9972c15e53419ae4 ≤ v < 449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5, c729696bcf8b23450043dd9c9972c15e53419ae4 ≤ v < 2a1780f9fc2493bd34c418a0be6fc58943afcecf, 5.3 | 644b666c202cce12ccfcf9ded67089b18f4f7659, 4a042d8e5f34282577ece50515cea8bb1246914d, bd8b4572528f9604a13bf3c7c2a167f5cf222f72, 57db27ccc162afe0726cffec0ae62e410ed2d0e9, 536407b272402af679155910d7fdeeb4834eefb9, 6452c13646af7c13d7f6668b6690cfb2427e7f7b, 449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5, 2a1780f9fc2493bd34c418a0be6fc58943afcecf |
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