CVE-2024-50063 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel and BPF program security, as well as those managing ICS systems using affected Siemens products, should assess exposure and verify configurations.

Why it matters

CVE-2024-50063 allows bypassing of security checks in BPF programs, potentially leading to unauthorized access or modifications. Defenders should verify Linux kernel and BPF program configurations to ensure security.

• Bypassing of context access verification for BPF programs
• Bypassing of return value rules for BPF programs
• Potential for unauthorized access or modifications
• Verification of Linux kernel and BPF program configurations required

Technical summary

The Linux kernel vulnerability (CVE-2024-50063) allows bypassing of context access or return value verification for BPF programs attached to different hooks. This occurs when a BPF program attached to one kernel function tail calls a BPF program attached to another kernel function with different parameters or return values. The verifier does not prevent such tail calls, potentially leading to bypassed assumptions for context access verification or return value rules. Defenders should prioritize verifying the Linux kernel version and BPF program configurations to ensure that vulnerable versions are not in use. They should also review and restrict BPF program attachments and tail call usage according to security

Defensive priority

Defenders should prioritize verifying the Linux kernel version and BPF program configurations to ensure that vulnerable versions are not in use. They should also review and restrict BPF program attachments and tail call usage according to organizational security policies.

Recommended defensive actions

• Verify Linux kernel version and BPF program configurations
• Review and restrict BPF program attachments and tail call usage
• Monitor for updates from Linux kernel maintainers and BPF developers
• 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 item provide details about the vulnerability in the Linux kernel, including its description and affected products. However, there is limited information on exploitation or specific attacks. The source item also includes references to various resources, such as CVE Program and NVD records.

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.