---
id: CVE-2026-98745
title: >-
  kernel: arm64/fpsimd: signal: Forbid non-streaming SVE payload on SME-only
  systems (CVE-2026-98745)
summary: >-
  A flaw was found in the Linux kernel. A local user can exploit this
  vulnerability to cause a denial of service (DoS) through a kernel crash. On
  ARM64 systems that support the Scalable Matrix Extension (SME) but lack the
  Scalable Vector Ext…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-1288
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T03:11:02+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98745.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98745.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98745'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555184'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98745'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98745'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98745.mbox
  - url: 'https://git.kernel.org/stable/c/052acee9880114879b5c221fc8dad69b786d0938'
  - url: 'https://git.kernel.org/stable/c/f2338929c7663859c0c74dd6fef2c0245066f845'
  - url: 'https://git.kernel.org/stable/c/2bce6f006cfe0b60e8249fd8d51396d99355cba3'
  - url: 'https://git.kernel.org/stable/c/88c1c611552b24658eb61244086691c02be2013b'
  - url: 'https://git.kernel.org/stable/c/e060d9069b49fe55f38057dfe592068014652671'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00168
epssPercentile: 0.05991
ingestedAt: '2026-10-18T16:47:32.501Z'
---

## Overview

A flaw was found in the Linux kernel. A local user can exploit this vulnerability to cause a denial of service (DoS) through a kernel crash. On ARM64 systems that support the Scalable Matrix Extension (SME) but lack the Scalable Vector Extension (SVE), the kernel improperly validates vector signal contexts during restoration. By supplying a specially crafted signal frame, an attacker can place the system into an invalid state, triggering a fatal processor exception.

## 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 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98745.json)

**kernel: arm64/fpsimd: signal: Forbid non-streaming SVE payload on SME-only systems** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.

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

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4

## Remediation

Fix deferred