CVE-2026-98077 Linux CVE debrief

Who should care

Linux kernel maintainers, network administrators, and security teams responsible for Linux systems should verify kernel versions, monitor network traffic, and apply patches to mitigate potential risks. This includes reviewing and applying patches from the Linux kernel maintainers, checking relevant monitoring, detection, and logs for exposed assets that need extra review, and tracking exceptions, retesting remediated assets, and closing the item only after

Why it matters

A vulnerability in the Linux kernel's netfilter component has been addressed, potentially allowing an attacker to trigger an out-of-bounds read. Linux kernel maintainers, network administrators, and security teams responsible for Linux systems should verify kernel versions, monitor network traffic, and apply patches.

• Verify Linux kernel versions to assess exposure
• Monitor network traffic for potential exploitation attempts
• Apply patches from the Linux kernel maintainers

Technical summary

The nf_conntrack_sip module in the Linux kernel did not properly handle SIP payloads with trailing whitespace, potentially allowing an attacker to trigger an out-of-bounds read. This vulnerability affects Linux kernel versions and could be exploited through specially crafted SIP payloads. Users should verify their kernel versions and assess exposure to SIP traffic to mitigate potential risks. The vulnerability was addressed in the Linux kernel, and users should apply patches to prevent exploitation. Linux kernel maintainers, network administrators, and security teams should review and apply patches from the Linux kernel maintainers.

Defensive priority

Verify Linux kernel versions and assess exposure to SIP traffic

Recommended defensive actions

• Verify Linux kernel versions and assess exposure to SIP traffic
• Review and apply patches from the Linux kernel maintainers
• Monitor network traffic for potential exploitation attempts
• 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 NVD entry provide details on the vulnerability, but do not specify versions or confirm exploitation. The vulnerability was addressed in the Linux kernel, and users should verify their kernel versions and assess exposure to SIP traffic. The CVE record was published on 2026-09-25T11:17:37.090Z and has not been modified since then.

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.