CVE-2026-98030 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux systems with the bcm_sf2 network driver should assess exposure and consider upgrading to a kernel version that includes the fix. These individuals should review kernel logs for signs of potential buffer overflow attempts and limit access to the ethtool command to trusted users.

Why it matters

A vulnerability in the Linux kernel's bcm_sf2 network driver allows unprivileged users to read beyond the bounds of a buffer allocated for CFP rules, potentially leading to information disclosure. Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux systems with the bcm_sf2 network driver should assess exposure and consider upgrading to a kernel version that includes the fix.

• Unprivileged users may be able to read sensitive information from the buffer
• Potential information disclosure

Technical summary

The bcm_sf2_cfp_rule_get_all function in the Linux kernel's bcm_sf2 network driver does not properly bound the number of CFP rules it retrieves, allowing unprivileged users to read beyond the bounds of a buffer allocated for CFP rules. This can potentially lead to information disclosure. The function should be reviewed and updated to properly bound the number of CFP rules it retrieves, and users should consider upgrading to a kernel version that includes the fix. The CVE record and NVD entry provide details about the vulnerability.

Defensive priority

Medium

Recommended defensive actions

• Review kernel logs for signs of potential buffer overflow attempts
• Limit access to the ethtool command to trusted users
• Consider upgrading to a kernel version that includes the fix
• Review compensating controls for exposed systems while remediation is scheduled and verified
• 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

Evidence notes

The CVE record and NVD entry provide details about the vulnerability, but do not specify which kernel versions are affected or provide a patch. The Linux kernel Git repository references are provided. Further verification is needed to determine the affected kernel versions and to confirm the fix. Defenders should review kernel logs for signs of potential buffer overflow attempts and limit access to the ethtool command to trusted users.

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.