# CVE-2026-89458

## Summary

- **CVE ID:** CVE-2026-89458
- **Severity:** UNKNOWN
- **CVSS Score:** 1.51
- **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: 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.

## Affected Products

- Linux — Linux (5e6bdd37c5526ef01326df5dabb93011ee89237e)
- Linux — Linux (fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04)
- Linux — Linux (5f7c9989f11305aaa43e0f4378f4f070022a9f2b)
- Linux — Linux (5.4.26)
- Linux — Linux (5.5.10)
- Linux — Linux (5.6)
- 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/c9adf8399732306dfc97b3adb4778038743e3f5e)
- [CNA](https://git.kernel.org/stable/c/52b331c99baac653ca794bd8487c8ec4de8db203)
- [CNA](https://git.kernel.org/stable/c/b0d94dd6e82df396e2254c8b0f25eff7d19c2e7f)
- [CNA](https://git.kernel.org/stable/c/cddb447c62466f3076938ce120028d7b591f9f37)
- [CNA](https://git.kernel.org/stable/c/8cb96cffceead3cbd0541154d7ecc5e6474edda1)
- [CNA](https://git.kernel.org/stable/c/77168af195d04b34c6de62b874624e74d64cef8d)
- [CNA](https://git.kernel.org/stable/c/921ff697bb6f7067059793becf8b2d00de71ce41)
- [CNA](https://git.kernel.org/stable/c/55f4df40178cdfede0d7ae848fbab00efa9b95c1)

## Exploitation Prediction (EPSS)

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

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._