# CVE-2026-89457

## Summary

- **CVE ID:** CVE-2026-89457
- **Severity:** UNKNOWN
- **CVSS Score:** 0
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 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.

## Affected Products

- Linux — Linux (c729696bcf8b23450043dd9c9972c15e53419ae4)
- Linux — Linux (5.3)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (5.10.270)
- Linux — Linux (5.15.221)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9)
- [CNA](https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b)
- [CNA](https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5)
- [CNA](https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf)
- [CNA](https://git.kernel.org/stable/c/644b666c202cce12ccfcf9ded67089b18f4f7659)
- [CNA](https://git.kernel.org/stable/c/4a042d8e5f34282577ece50515cea8bb1246914d)
- [CNA](https://git.kernel.org/stable/c/bd8b4572528f9604a13bf3c7c2a167f5cf222f72)
- [CNA](https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.18%
- **EPSS Percentile:** 7.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._