---
id: CVE-2026-89456
title: 's390/dasd: Propagate partial completion length across ERP recovery'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  s390/dasd: Propagate partial completion length across ERP recovery

  dasd_default_erp_postaction() copies the timing and device state from
  the finished ERP request back …
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-908
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e <
    9e063165d3fe58db2a517717b830f17e82d03467
  - >-
    Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e <
    6b0954c8a259da1e4aa745989f82723947acfb46
  - >-
    Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e <
    d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f
  - >-
    Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e <
    f735b9710f0c8fe72c1060103e865f4ae678190b
  - >-
    Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e <
    d6b8778b1b82aa3a8dbf8612080f635b834bd16b
  - >-
    Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e <
    ceafb262475ac6cb3a7d07b1102608be2b216b99
  - >-
    Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e <
    15ec03452c18e8d288e519837d21b308300d74b2
  - >-
    Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e <
    6fb5ba2e7e43173a3761e46f091070a8185efa14
  - Linux fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04
  - Linux 5f7c9989f11305aaa43e0f4378f4f070022a9f2b
  - Linux >= 5.4.26 < 5.5
  - Linux >= 5.5.10 < 5.6
  - Linux 5.6
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:47:05.735Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89456'
references:
  - url: 'https://git.kernel.org/stable/c/9e063165d3fe58db2a517717b830f17e82d03467'
  - url: 'https://git.kernel.org/stable/c/6b0954c8a259da1e4aa745989f82723947acfb46'
  - url: 'https://git.kernel.org/stable/c/d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f'
  - url: 'https://git.kernel.org/stable/c/f735b9710f0c8fe72c1060103e865f4ae678190b'
  - url: 'https://git.kernel.org/stable/c/d6b8778b1b82aa3a8dbf8612080f635b834bd16b'
  - url: 'https://git.kernel.org/stable/c/ceafb262475ac6cb3a7d07b1102608be2b216b99'
  - url: 'https://git.kernel.org/stable/c/15ec03452c18e8d288e519837d21b308300d74b2'
  - url: 'https://git.kernel.org/stable/c/6fb5ba2e7e43173a3761e46f091070a8185efa14'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89456.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89456'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532243'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89456'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89456'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89456.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00149
epssPercentile: 0.04061
ingestedAt: '2026-09-14T15:23:07.453Z'
---

## Overview

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

s390/dasd: Propagate partial completion length across ERP recovery

dasd_default_erp_postaction() copies the timing and device state from
the finished ERP request back to the original request but drops
proc_bytes. A request that was partially completed, an ESE read of a
not-yet-allocated track returns fewer bytes than requested, and then
recovered through the ERP chain loses its partial-completion length.
__dasd_cleanup_cqr() then sees proc_bytes == 0 and completes the whole
request instead of requeueing the remainder, silently returning zeroed
data for the part that was never read.

Carry proc_bytes over to the original request like the other
per-request state.

## Affected

- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < 9e063165d3fe58db2a517717b830f17e82d03467`
- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < 6b0954c8a259da1e4aa745989f82723947acfb46`
- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f`
- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < f735b9710f0c8fe72c1060103e865f4ae678190b`
- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < d6b8778b1b82aa3a8dbf8612080f635b834bd16b`
- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < ceafb262475ac6cb3a7d07b1102608be2b216b99`
- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < 15ec03452c18e8d288e519837d21b308300d74b2`
- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < 6fb5ba2e7e43173a3761e46f091070a8185efa14`
- `Linux fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04`
- `Linux 5f7c9989f11305aaa43e0f4378f4f070022a9f2b`
- `Linux >= 5.4.26 < 5.5`
- `Linux >= 5.5.10 < 5.6`
- `Linux 5.6`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89456.json)