CVE-2026-98948 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel security, Linux kernel developers, and administrators of affected systems should assess exposure and apply the fix. They should prioritize verifying and applying the fix to prevent potential resource leaks and increased risk of denial-of-service (DoS) attacks. Affected operator, platform, vulnerability-management, and security-team impact should be carefully evaluated.

Why it matters

A port range register leak was found in the Linux kernel's mlxsw: spectrum_flower: Fix port range register leak in tmplt_create(). Defenders should prioritize verifying and applying the fix to prevent potential resource leaks and increased risk of denial-of-service (DoS) attacks.

• Potential resource leaks due to unreleased port range registers
• Increased risk of denial-of-service (DoS) attacks
• Need for verification and application of the fix

Technical summary

The Linux kernel's mlxsw: spectrum_flower: Fix port range register leak in tmplt_create() has been resolved by factoring out the code to release necessary resources from mlxsw_sp_acl_rulei_destroy() and calling it from mlxsw_sp_flower_tmplt_create(). This fix addresses a port range register leak, preventing potential resource leaks and increased risk of denial-of-service (DoS) attacks. Defenders should prioritize verifying and applying the fix to prevent potential resource leaks and review affected Linux kernel versions.

Defensive priority

Defenders should prioritize verifying and applying the fix to prevent potential resource leaks.

Recommended defensive actions

• Verify and apply the fix to prevent potential resource leaks
• Review and update affected Linux kernel versions
• Monitor for potential exploitation attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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

Evidence notes

The issue was found during a review of Wentao Liang's patch. The fix involves factoring out code from mlxsw_sp_acl_rulei_destroy() and calling it from mlxsw_sp_flower_tmplt_create(). This change ensures that port range registers are released, preventing resource leaks. Defenders should verify the fix and review affected Linux kernel versions.

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.