CVE-2026-53078 Linux CVE debrief

Who should care

Linux kernel developers, administrators, and users of affected kernel versions should be aware of this vulnerability and take steps to mitigate potential risks, including verifying Linux kernel versions and configurations, applying patches, monitoring systems for unusual activity or errors related to BPF sock_ops programs, and validating fixes through testing and validation to ensure mitigation. This includes operators managing affected systems, platform,

Why it matters

This vulnerability in the Linux kernel's BPF sock_ops program can lead to out-of-bounds reads and kernel pointer leaks, potentially affecting system stability and security. Linux kernel developers, administrators, and users of affected kernel versions should prioritize assessing exposure and applying patches to mitigate potential risks.

• Verify Linux kernel versions and configurations to assess exposure
• Apply patches to prevent potential stack-out-of-bounds access or kernel pointer leaks
• Monitor systems for unusual activity or errors related to BPF sock_ops programs
• Validate fixes through testing and validation to ensure mitigation

Technical summary

The Linux kernel's BPF sock_ops program has a vulnerability where accessing ctx fields with the same destination and source registers can lead to out-of-bounds reads and kernel pointer leaks. This occurs because the SOCK_OPS_GET_SK() and SOCK_OPS_GET_FIELD() macros do not properly zero the destination register in certain paths, retaining stale ctx pointers. The vulnerability affects various Linux kernel versions, including those from 5.4.61 to 5.5, 5.7.18 to 5.8, 5.8.4 to 5.9, and 5.9.1 to 7.0.10.

Defensive priority

Linux kernel developers and administrators should prioritize assessing exposure and applying patches to mitigate potential risks.

Recommended defensive actions

• Assess exposure by reviewing Linux kernel versions and configurations
• Apply patches from Linux kernel maintainers
• Monitor systems for potential stack-out-of-bounds access or kernel pointer leaks
• Verify fixes through testing and validation
• 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 CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected kernel versions. Multiple patch references are available, indicating fixes for the issue.

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.