CVE-2026-92486 Linux CVE debrief

Who should care

System administrators and security teams responsible for systems relying on BPF and task work callbacks, especially those with untrusted BPF programs, should prioritize patching and monitoring. These teams must ensure that BPF program execution and task work callbacks are reviewed for unusual activity. Additionally, they should consider implementing compensating controls for exposed systems while remediation is scheduled and verified. Security teams should

Why it matters

A vulnerability in the Linux kernel's BPF subsystem has been addressed, and system administrators and security teams should verify and apply patches to ensure the security of affected systems.

• Verification of BPF program execution and task work callbacks for unusual activity.
• Potential security risks associated with CFI mismatch in task work callbacks.
• Need for patching and updating Linux kernel to ensure CFI mismatch is resolved.

Technical summary

The Linux kernel's BPF subsystem had a vulnerability related to CFI mismatch in task work callbacks. This issue has been resolved through specific commits in the Linux kernel source, ensuring that BPF subprograms use the bpf_callback_t ABI. The fix prevents kCFI trips by aligning the BPF subprogram ABI with task work callback requirements. This change is crucial for maintaining the security and integrity of systems relying on BPF and task work callbacks, especially in environments with untrusted BPF programs. The vulnerability was addressed by storing and invoking the callback as bpf_callback_t, thus resolving the CFI mismatch.

Defensive priority

Medium priority for systems relying on BPF and task work callbacks, especially those with untrusted BPF programs.

Recommended defensive actions

• Review and apply the relevant patches from the Linux kernel to ensure the CFI mismatch is resolved.
• Monitor BPF program execution and task work callbacks for unusual activity.
• Consider implementing additional security measures for systems relying on BPF and task work callbacks.
• Perform a thorough review of current BPF program deployments to identify potential security risks.
• Verify that all necessary security updates are applied and that systems are protected against known vulnerabilities.
• Conduct regular security audits to ensure compliance with organizational security policies.
• Engage with the Linux kernel community or relevant security forums for updates on this vulnerability and related patches.

Evidence notes

The CVE record and associated source item provide details on the vulnerability, including its resolution through specific commits in the Linux kernel source. However, the record does not provide explicit information on exploitation or impact.

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.