CVE-2026-98408 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution vendors, and users of Linux kernel versions 6.12 and later should assess exposure and apply patches to prevent division by zero in the watchdog rzv2h component. The vulnerability could lead to a system panic if exploited, making it critical for those responsible for maintaining and securing Linux kernel deployments to take action.

Why it matters

A vulnerability in the Linux kernel's watchdog component could lead to a division by zero issue. Linux kernel maintainers, Linux distribution vendors, and users of Linux kernel versions 6.12 and later should assess exposure and apply patches.

• Verify Linux kernel versions to determine exposure
• Apply patches to prevent division by zero in the watchdog rzv2h component
• Monitor Linux kernel version updates for potential security patches

Technical summary

The Linux kernel's watchdog component is vulnerable to a division by zero issue due to clk_get_rate() returning 0. This has been addressed through patches that check for a zero rate before performing the division. The vulnerability affects Linux kernel versions 6.12 and later. Maintainers and users should assess exposure and apply patches to prevent division by zero in the watchdog rzv2h component. The patches provided ensure that a division by zero does not occur, preventing potential system panics. The issue was resolved by adding a check for a zero rate before performing the division.

Defensive priority

Verify Linux kernel versions and apply patches to prevent division by zero in the watchdog rzv2h component.

Recommended defensive actions

• Verify Linux kernel versions and apply patches to prevent division by zero in the watchdog rzv2h component.
• Review Linux kernel version 6.12 and later for potential exposure.
• Check for and apply Linux kernel patches referenced in the source item.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• technicalSummary

Evidence notes

The CVE record and source item provide details on the vulnerability, including affected versions and references to patches. The Linux kernel's watchdog component is vulnerable to a division by zero issue due to clk_get_rate() returning 0. This has been addressed through patches. The source item provides details on the vulnerability, including affected versions and references to patches. The CVE record was published on 2026-10-14T13:27:42.390Z and has not been modified since then.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.