---
id: CVE-2026-89528
title: 'svcrdma: Reject Read lists that exceed the page budget'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  svcrdma: Reject Read lists that exceed the page budget

  Individual Read segment lengths are validated at decode time, but
  nothing prevents a requester from sending mult…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-476
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 026d958b38c628a1b4ced534808945365e2747a5 <
    beb4e9801f6362436102acc4cc5304b7324f9365
  - >-
    Linux >= 026d958b38c628a1b4ced534808945365e2747a5 <
    e70fdb121171c3eb0ac34eb545721828cd737717
  - >-
    Linux >= 026d958b38c628a1b4ced534808945365e2747a5 <
    1a3af2262cb384112ef38632de4690682be528b4
  - >-
    Linux >= 026d958b38c628a1b4ced534808945365e2747a5 <
    465f511f59a0fa7a80d5d1073c4b24f28ea38f58
  - >-
    Linux >= 026d958b38c628a1b4ced534808945365e2747a5 <
    0ca487abb3bdf581851664b5db21f364caf57682
  - Linux 4.13
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T19:23:02.453234Z'
published: '2026-09-11'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:47:41.509Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89528'
references:
  - url: 'https://git.kernel.org/stable/c/beb4e9801f6362436102acc4cc5304b7324f9365'
  - url: 'https://git.kernel.org/stable/c/e70fdb121171c3eb0ac34eb545721828cd737717'
  - url: 'https://git.kernel.org/stable/c/1a3af2262cb384112ef38632de4690682be528b4'
  - url: 'https://git.kernel.org/stable/c/465f511f59a0fa7a80d5d1073c4b24f28ea38f58'
  - url: 'https://git.kernel.org/stable/c/0ca487abb3bdf581851664b5db21f364caf57682'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89528.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89528'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532188'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89528'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89528'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89528.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00651
epssPercentile: 0.50978
scores:
  cna: 7.5
  vendor: 7
ingestedAt: '2026-09-14T15:23:07.475Z'
---

## Overview

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

svcrdma: Reject Read lists that exceed the page budget

Individual Read segment lengths are validated at decode time, but
nothing prevents a requester from sending multiple segments whose
cumulative length exceeds the rq_pages array budget. When one
segment fills the page array exactly, the runtime guard in
svc_rdma_build_read_segment() is bypassed because len reaches zero.
A subsequent segment then accesses the NULL sentinel slot at
rq_pages[rq_maxpages], resulting in a NULL pointer dereference during
DMA mapping.

Accumulate pages across all Read segments and reject the message at
decode time when the total would overflow the page budget.

## Affected

- `Linux >= 026d958b38c628a1b4ced534808945365e2747a5 < beb4e9801f6362436102acc4cc5304b7324f9365`
- `Linux >= 026d958b38c628a1b4ced534808945365e2747a5 < e70fdb121171c3eb0ac34eb545721828cd737717`
- `Linux >= 026d958b38c628a1b4ced534808945365e2747a5 < 1a3af2262cb384112ef38632de4690682be528b4`
- `Linux >= 026d958b38c628a1b4ced534808945365e2747a5 < 465f511f59a0fa7a80d5d1073c4b24f28ea38f58`
- `Linux >= 026d958b38c628a1b4ced534808945365e2747a5 < 0ca487abb3bdf581851664b5db21f364caf57682`
- `Linux 4.13`

## 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 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89528.json)