CVE-2026-98489 Linux CVE debrief

Who should care

Linux kernel administrators and developers using the atl1c driver should assess exposure and verify system updates. They should also monitor system logs for soft lockup errors and review compensating controls for exposed systems. Limited source detail was provided, so explicit evidence-limit language and defensive verification tasks are recommended for defenders. Assess exposure on Linux systems with Qualcomm Atheros AR8151 v2.0, 4-port NIC.

Why it matters

CVE-2026-98489 is a Linux kernel vulnerability causing soft lockup in the atl1c driver. Defenders should verify system updates and monitor logs.

• Verify Linux kernel and atl1c driver updates
• Monitor system logs for soft lockup errors
• Assess exposure on Linux systems with Qualcomm Atheros AR8151 v2.0, 4-port NIC

Technical summary

The atl1c driver in the Linux kernel is vulnerable to a soft lockup issue caused by an out-of-range tpd_cons value. This value can be reported by the hardware while the PCIe link/MAC is resetting. The issue has been resolved by treating out-of-range values as 'nothing new to clean'. The vulnerability affects Linux kernel administrators and developers using the atl1c driver. Verify system updates and monitor logs for soft lockup errors on Linux systems with Qualcomm Atheros AR8151 v2.0, 4-port NIC. Limited source detail was provided, so explicit evidence-limit language and defensive verification tasks are recommended for defenders.

Defensive priority

Medium

Recommended defensive actions

• Update Linux kernel to the latest version
• Verify atl1c driver is up-to-date
• Monitor system logs for soft lockup errors
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions, retest remediated assets
• Confirm whether affected product deployments exist in managed environments

Evidence notes

The vulnerability was verified on two machines with Qualcomm Atheros AR8151 v2.0, 4-port NIC, triggered by rebooting a Mikrotik CCR2004 PCIe card. The issue was captured with full traces on Ubuntu 26.04.1 LTS and Proxmox VE. Limited source detail was provided, so explicit evidence-limit language and defensive verification tasks are recommended for defenders. Verify atl1c driver and Linux kernel updates, monitor system logs for soft lockup errors, and assess exposure on Linux systems with Qualcomm Atheros AR8151 v2.0, 4-port NIC.

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.