CVE-2026-98058 Linux CVE debrief

Who should care

Linux kernel developers, maintainers, and users of BPF programs should assess exposure and verify patched versions to prevent potential scheduling-while-atomic failures. This includes reviewing Linux kernel versions for patched updates, verifying system configurations for BPF program usage, and monitoring for potential scheduling-while-atomic failures. Affected operator, platform, vulnerability-management, and security-team impact should be carefullyevalu

Why it matters

The Linux kernel vulnerability requires verification of patched versions and BPF program updates to prevent scheduling-while-atomic failures.

• Verification of patched Linux kernel versions is required to prevent potential scheduling-while-atomic failures.
• Linux kernel developers and maintainers should assess exposure and update BPF programs accordingly.

Technical summary

The Linux kernel vulnerability involves syscall helpers not being marked as sleepable, potentially causing scheduling-while-atomic failures. The issue has been resolved by adding the .might_sleep annotation to the prototypes of bpf_sys_bpf() and bpf_sys_close(). This change ensures that the existing helper-context check rejects them from timer callbacks and other atomic regions, preventing potential scheduling-while-atomic failures. The resolution requires verification of patched Linux kernel versions and BPF program updates to prevent scheduling-while-atomic failures

Defensive priority

Linux kernel developers and maintainers should assess exposure and verify patched versions.

Recommended defensive actions

• Review Linux kernel versions for patched updates.
• Verify system configurations for BPF program usage.
• Monitor for potential scheduling-while-atomic failures.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• 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

Evidence notes

The CVE record and NVD entry provide details on the vulnerability and its resolution in the Linux kernel. The vulnerability involves syscall helpers not being marked as sleepable, potentially causing scheduling-while-atomic failures. The resolution adds the .might_sleep annotation to prevent such failures. Evidence is limited to CVE Program and NVD entries, which provide source-provided CVE metadata and official vulnerability assessment. Further verification is recommended to confirm affected scope, severity, and vendor guidance

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.