CVE-2026-98622 Linux CVE debrief

Who should care

Linux kernel developers and administrators who manage Linux systems with the `act_ct` classifier. They should review and apply the patch to prevent potential issues. The vulnerability could cause warnings under certain conditions, potentially leading to system panics if `panic_on_warn=1` is set. Linux kernel developers and administrators should review and apply the patch to prevent potential issues and monitor system logs for any related issues. Also, they

Why it matters

The Linux kernel vulnerability could cause warnings under certain conditions, potentially leading to system panics if `panic_on_warn=1` is set. Linux kernel developers and administrators should review and apply the patch to prevent potential issues.

• An unprivileged user could potentially panic the system if `panic_on_warn=1` is set
• The system may experience warnings under certain conditions

Technical summary

The Linux kernel vulnerability was related to the `act_ct` classifier and the `flow_offload_alloc()` function. The warning was removed to prevent panics under certain conditions. This vulnerability could cause a warning under certain conditions when using the `act_ct` classifier. The warning was triggered when `flow_offload_alloc()` returned NULL, which can occur when the conntrack entry is dying or when the GFP_ATOMIC allocation fails. This issue could be exploited by an unprivileged user to panic the system if `panic_on_warn=1` is set.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patch to the Linux kernel
• Verify that the system is running with the latest kernel version
• Monitor system logs for any related issues
• 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
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record and source references indicate that the vulnerability was resolved in the Linux kernel. The issue was related to the `act_ct` classifier and the `flow_offload_alloc()` function. The warning was removed to prevent panics under certain conditions.

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.