SB20261022352 - Improper input validation in Linux kernel arm64 kernel

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Main Vulnerability Database SB20261022352

SB20261022352 - Improper input validation in Linux kernel arm64 kernel

Published: October 22, 2026

Security Bulletin ID SB20261022352
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper input validation (CVE-ID: CVE-2026-98745)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service by triggering a kernel panic.

The vulnerability exists due to improper input validation in restore_sve_fpsimd_context() in the Linux kernel arm64 signal-handling code when restoring a user-supplied SVE signal context. A local user can supply a crafted context with SVE_SIG_FLAG_SM clear and an SVE payload present to establish unsupported non-streaming SVE state, causing subsequent state restoration to trigger a fatal kernel undefined-instruction exception.

Exploitation requires an arm64 system that supports SME but does not support SVE.


Remediation

Install update from vendor's website.

References