CVE-2026-98676 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and organizations deploying Linux-based systems, particularly those using the ADE9000 as a clock provider, should verify their exposure and apply necessary updates to prevent system crashes and potential denial of service (DoS).

Why it matters

A NULL pointer dereference vulnerability in the Linux kernel's iio: adc: ade9000 component can cause system crashes and potential denial of service (DoS) in Linux-based systems. Linux kernel developers, maintainers, and organizations deploying Linux-based systems should verify their exposure and apply necessary updates.

• System crash on probing ADE9000 with external input clock
• Potential denial of service (DoS) due to system crash
• Need for verification of Linux kernel version and exposure

Technical summary

The Linux kernel's iio: adc: ade9000 component has a NULL pointer dereference vulnerability. When probing an ADE9000 configured as a clock provider with an external input clock, the system crashes due to a NULL address being dereferenced during clock registration. This occurs because the common clock framework calls clk_divider_recalc_rate(), which attempts to access the register address through readl(). The fix involves registering the CLKOUT as a 1:1 fixed-factor clock, which does not require register access, thus avoiding the NULL pointer dereference.

Defensive priority

Verify and apply kernel updates; assess exposure in Linux kernel deployments

Recommended defensive actions

• Verify Linux kernel version and apply updates if necessary
• Assess exposure in Linux kernel deployments
• Monitor system logs for potential crash indicators
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but do not specify affected or fixed versions. The Linux kernel community has resolved the issue. To verify exposure, defenders should check the Linux kernel version used in their deployments and compare it with the fixed version. The absence of specific version information in the CVE record and NVD entry limits the ability to definitively identify affected systems without further investigation.

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.