CVE-2026-98416 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution maintainers, and users of affected Linux kernel versions should assess exposure and prioritize verification and remediation. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Why it matters

A NULL dereference vulnerability in the Linux kernel's dmaengine: ti: k3-udma-glue can lead to a denial-of-service (DoS) condition. Linux kernel maintainers and users should assess exposure and prioritize verification of affected versions.

• Verify Linux kernel versions for exposure
• Apply patches to affected versions
• Monitor Linux kernel updates for remediation

Technical summary

The vulnerability occurs in the Linux kernel's dmaengine: ti: k3-udma-glue. When devm_kcalloc() fails to allocate memory for rx_chn->flows, a NULL pointer dereference happens in k3_udma_glue_release_rx_flow(). The fix skips the flow release loop in k3_udma_glue_release_rx_chn() when rx_chn->flows is not allocated. This fix prevents a denial-of-service (DoS) condition that could be triggered by a local attacker. Linux kernel maintainers and users should assess exposure and prioritize verification of affected versions.

Defensive priority

Linux kernel maintainers and users should assess exposure and prioritize verification of affected versions.

Recommended defensive actions

• Review Linux kernel versions for exposure
• Verify affected versions and apply patches
• Monitor Linux kernel updates for remediation
• 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.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The Linux Verification Center (linuxtesting.org) found this vulnerability using SVACE. The vulnerability was resolved by fixing the NULL dereference in k3_udma_glue_release_rx_chn(). The fix was verified through code review and testing to ensure that it properly handles the memory allocation failure and prevents the NULL pointer dereference.

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.