SB2026102234 - Use-after-free in Linux kernel riscv kvm

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Main Vulnerability Database SB2026102234

SB2026102234 - Use-after-free in Linux kernel riscv kvm

Published: October 22, 2026

Security Bulletin ID SB2026102234
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) Use-after-free (CVE-ID: CVE-2026-98464)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to trigger use-after-free in the host kernel, potentially causing a denial of service.

The vulnerability exists due to use-after-free in the RISC-V KVM non-Sstc vCPU timer implementation when teardown frees a vCPU without synchronizing with a running timer callback. A local user can arm the timer from a guest using SBI TIME and request shutdown using SBI legacy shutdown or SRST to race the callback against vCPU destruction, potentially crashing the host when the VMM honors KVM_EXIT_SYSTEM_EVENT and destroys the VM.


Remediation

Install update from vendor's website.

References