In the Linux kernel, the following vulnerability has been resolved:

s390/dasd: Do not complete a failed ESE read as successful

dasd_int_handler() completes an NRF read of an unallocated ESE track by
calling ese_read() and unconditionally marking the request
DASD_CQR_SUCCESS. dasd_eckd_ese_read() can return an error before it has
zeroed the destination buffer: a failed sense-data parse or a current
track outside the requested range both return early, leaving the
destination pages untouched. The request is still completed successfully,
so the block layer is handed stale / uninitialized memory instead of
zeros.

Check the ese_read() return value and fail the request through the normal
error path instead of forcing DASD_CQR_SUCCESS.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required High

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
5e6bdd37c5526ef01326df5dabb93011ee89237e affected < c9adf8399732306dfc97b3adb4778038743e3f5e
5e6bdd37c5526ef01326df5dabb93011ee89237e affected < 52b331c99baac653ca794bd8487c8ec4de8db203
5e6bdd37c5526ef01326df5dabb93011ee89237e affected < b0d94dd6e82df396e2254c8b0f25eff7d19c2e7f
5e6bdd37c5526ef01326df5dabb93011ee89237e affected < cddb447c62466f3076938ce120028d7b591f9f37
fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04 affected —
5f7c9989f11305aaa43e0f4378f4f070022a9f2b affected —
5.4.26 affected < 5.5
5.5.10 affected < 5.6
Linux Linux affected
Version Status Constraints
5.6 affected —
0 unaffected < 5.6
6.12.109 unaffected ≤ 6.12.*
6.18.50 unaffected ≤ 6.18.*
7.2.4 unaffected ≤ 7.2.*
7.3-rc1 unaffected ≤ *

No data.

No data.

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/52b331c99baac653ca794bd8487c8ec4de8db203 cve-icon cve-icon cve-icon
https://git.kernel.org/stable/c/b0d94dd6e82df396e2254c8b0f25eff7d19c2e7f cve-icon cve-icon cve-icon
https://git.kernel.org/stable/c/c9adf8399732306dfc97b3adb4778038743e3f5e cve-icon cve-icon cve-icon
https://git.kernel.org/stable/c/cddb447c62466f3076938ce120028d7b591f9f37 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-89458 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-89458 cve-icon
History

Sat, 12 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-824
References
Metrics threat_severity

None

 cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H'}

threat_severity

Moderate

Fri, 11 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: s390/dasd: Do not complete a failed ESE read as successful dasd_int_handler() completes an NRF read of an unallocated ESE track by calling ese_read() and unconditionally marking the request DASD_CQR_SUCCESS. dasd_eckd_ese_read() can return an error before it has zeroed the destination buffer: a failed sense-data parse or a current track outside the requested range both return early, leaving the destination pages untouched. The request is still completed successfully, so the block layer is handed stale / uninitialized memory instead of zeros. Check the ese_read() return value and fail the request through the normal error path instead of forcing DASD_CQR_SUCCESS.
Title s390/dasd: Do not complete a failed ESE read as successful
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-09-11T19:43:21.346Z

Reserved: 2026-09-11T19:38:34.707Z

Link: CVE-2026-89458

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-11T20:19:26.657

Modified: 2026-09-11T20:19:26.657

Link: CVE-2026-89458

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-11T19:43:21Z

Links: CVE-2026-89458 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-12T03:00:10Z

Weaknesses