CVE-2026-89457
s390/dasd: Guard sysfs discipline callbacks against unallocated private data
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.
INFO
Published Date :
Sept. 11, 2026, 8:19 p.m.
Last Modified :
Sept. 14, 2026, 1:19 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Guard sysfs callbacks accessing device private data.
- Ensure private data is allocated before access.
- Apply kernel patches to fix the issue.
- Update the Linux kernel to the patched version.
References to Advisories, Solutions, and Tools
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information, practical solutions, and valuable tools related to
CVE-2026-89457.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-89457 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-89457
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-89457 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-89457 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 14, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/89xxx/CVE-2026-89457.json">CVE-2026-89457</a> Added Reference https://git.kernel.org/stable/c/4a042d8e5f34282577ece50515cea8bb1246914d Added Reference https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9 Added Reference https://git.kernel.org/stable/c/644b666c202cce12ccfcf9ded67089b18f4f7659 Added Reference https://git.kernel.org/stable/c/bd8b4572528f9604a13bf3c7c2a167f5cf222f72 -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 11, 2026
Action Type Old Value New Value Added 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. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/89xxx/CVE-2026-89457.json">CVE-2026-89457</a> Added Reference https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf Added Reference https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5 Added Reference https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9 Added Reference https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b