CVE-2026-98668 Linux CVE debrief

Who should care

Linux kernel maintainers, users, and administrators should assess exposure and prioritize verification of affected systems, especially those with unaligned data and timestamp enabled.

Why it matters

A vulnerability in the Linux kernel can leak uninitialized heap memory to userspace, potentially disclosing sensitive information. Linux kernel maintainers and users should assess exposure and prioritize verification of affected systems, especially those with unaligned data and timestamp enabled.

• Potential information disclosure due to uninitialized heap memory leak
• Verification of affected systems and versions is required
• Patching or mitigation of vulnerable systems is necessary

Technical summary

The Linux kernel's iio_push_to_buffers_with_ts_unaligned() function can leak uninitialized heap memory to userspace if the data passed in is not a multiple of 8 bytes and the timestamp is enabled. This issue has been resolved by specifying __GFP_ZERO for the devm_krealloc() to ensure any extra space is cleared. The vulnerability affects Linux kernel deployments with unaligned data and timestamp enabled, potentially disclosing sensitive information. Linux kernel maintainers and users should assess exposure and prioritize verification of affected systems, especially those with unaligned data and timestamp enabled.

Defensive priority

Linux kernel maintainers and users should assess exposure and prioritize verification of affected systems, especially those with unaligned data and timestamp enabled.

Recommended defensive actions

• Review Linux kernel configurations and versions to determine exposure
• Verify that systems with unaligned data and timestamp enabled are patched or mitigated
• Monitor for potential exploitation attempts
• 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
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but the scope of affected systems and versions is not explicitly stated. The vulnerability is resolved in the Linux kernel, but specific versions and configurations may still be vulnerable. Defenders should verify Linux kernel configurations and versions to determine exposure, review official advisories or CVE records for affected scope and severity, and plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

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.