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CVE-2026-89457

UnknownEPSS 0.17%

Last modified

CVE-2026-89457 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.17%

6.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= c729696bcf8b23450043dd9c9972c15e53419ae4, < 644b666c202cce12ccfcf9ded67089b18f4f7659; >= c729696bcf8b23450043dd9c9972c15e53419ae4, < 4a042d8e5f34282577ece50515cea8bb1246914d; >= c729696bcf8b23450043dd9c9972c15e53419ae4, < bd8b4572528f9604a13bf3c7c2a167f5cf222f72; >= c729696bcf8b23450043dd9c9972c15e53419ae4, < 57db27ccc162afe0726cffec0ae62e410ed2d0e9; >= c729696bcf8b23450043dd9c9972c15e53419ae4, < 536407b272402af679155910d7fdeeb4834eefb9; >= c729696bcf8b23450043dd9c9972c15e53419ae4, < 6452c13646af7c13d7f6668b6690cfb2427e7f7b; >= c729696bcf8b23450043dd9c9972c15e53419ae4, < 449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5; >= c729696bcf8b23450043dd9c9972c15e53419ae4, < 2a1780f9fc2493bd34c418a0be6fc58943afcecf
LinuxLinux5.3

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89457?
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 severe is CVE-2026-89457?
Severity scoring for CVE-2026-89457 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89457?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST