CVE-2026-89457

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

State: Published
Severity: Not scored
Published: Sep 11, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	c729696bcf8b23450043dd9c9972c15e53419ae4 to before 644b666c202cce12ccfcf9ded67089b18f4f7659Affected c729696bcf8b23450043dd9c9972c15e53419ae4 to before 4a042d8e5f34282577ece50515cea8bb1246914dAffected c729696bcf8b23450043dd9c9972c15e53419ae4 to before bd8b4572528f9604a13bf3c7c2a167f5cf222f72Affected c729696bcf8b23450043dd9c9972c15e53419ae4 to before 57db27ccc162afe0726cffec0ae62e410ed2d0e9Affected c729696bcf8b23450043dd9c9972c15e53419ae4 to before 536407b272402af679155910d7fdeeb4834eefb9Affected c729696bcf8b23450043dd9c9972c15e53419ae4 to before 6452c13646af7c13d7f6668b6690cfb2427e7f7bAffected c729696bcf8b23450043dd9c9972c15e53419ae4 to before 449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5Affected c729696bcf8b23450043dd9c9972c15e53419ae4 to before 2a1780f9fc2493bd34c418a0be6fc58943afcecfAffected
LinuxLinux	5.3Affected before 5.3Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.109 through 6.12.Not affected 6.18.50 through 6.18.Not affected 7.2.4 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

c729696bcf8b23450043dd9c9972c15e53419ae4 to before 644b666c202cce12ccfcf9ded67089b18f4f7659Affected
c729696bcf8b23450043dd9c9972c15e53419ae4 to before 4a042d8e5f34282577ece50515cea8bb1246914dAffected
c729696bcf8b23450043dd9c9972c15e53419ae4 to before bd8b4572528f9604a13bf3c7c2a167f5cf222f72Affected
c729696bcf8b23450043dd9c9972c15e53419ae4 to before 57db27ccc162afe0726cffec0ae62e410ed2d0e9Affected
c729696bcf8b23450043dd9c9972c15e53419ae4 to before 536407b272402af679155910d7fdeeb4834eefb9Affected
c729696bcf8b23450043dd9c9972c15e53419ae4 to before 6452c13646af7c13d7f6668b6690cfb2427e7f7bAffected
c729696bcf8b23450043dd9c9972c15e53419ae4 to before 449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5Affected
c729696bcf8b23450043dd9c9972c15e53419ae4 to before 2a1780f9fc2493bd34c418a0be6fc58943afcecfAffected

LinuxLinux

5.3Affected
before 5.3Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.109 through 6.12.*Not affected
6.18.50 through 6.18.*Not affected
7.2.4 through 7.2.*Not affected
7.3 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.