CVE-2026-99020 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel deployments should assess exposure and prioritize verification of kernel versions and application of fixes. This includes operators, platform administrators, and security teams who manage Linux kernel-based systems. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Why it matters

Defenders should prioritize verifying Linux kernel versions and applying fixes to prevent potential out-of-bounds reads when checking voltage constraints.

• Verify Linux kernel versions to determine exposure
• Apply fixes to prevent out-of-bounds reads

Technical summary

The Linux kernel regulator: tps6594-regulator module has a vulnerability where the TPS65224 BUCK2, BUCK3, and BUCK4 descriptors incorrectly pass 4 as n_linear_ranges, but the tps65224_bucks_2_3_4_ranges[] array only has two entries. This could lead to out-of-bounds reads when checking voltage constraints. The vulnerability affects Linux kernel deployments using the tps6594-regulator module. Defenders should prioritize verifying Linux kernel versions and applying fixes to prevent potential out-of-bounds reads when checking voltage constraints.

Defensive priority

Defenders should prioritize verifying the Linux kernel versions used in their deployments and applying the fixes provided by the Linux kernel maintainers.

Recommended defensive actions

• Verify Linux kernel versions used in deployments
• Apply fixes provided by Linux kernel maintainers
• Check voltage constraints against every selector
• Review compensating controls for exposed systems while remediation is scheduled and verified
• 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
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record and source item provide details about a vulnerability in the Linux kernel regulator: tps6594-regulator module. The TPS65224 BUCK2, BUCK3, and BUCK4 descriptors incorrectly pass 4 as n_linear_ranges, but the tps65224_bucks_2_3_4_ranges[] array only has two entries. This could lead to out-of-bounds reads when checking voltage constraints.

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.