CVE-2026-23148 Linux CVE debrief

Who should care

Linux kernel developers and administrators responsible for maintaining and securing Linux-based systems should assess exposure and apply patches or updates to fixed versions. They should verify affected versions and configurations to prioritize patching and monitor for potential exploitation attempts.

Why it matters

This CVE record details a vulnerability in the Linux kernel's nvmet_bio_done() function, which can cause a NULL pointer dereference. Linux kernel developers and administrators should assess exposure and apply patches or updates to fixed versions.

• Verify affected versions and configurations to prioritize patching
• Apply patches or updates to fixed versions to prevent potential crashes

Technical summary

The Linux kernel's nvmet_bio_done() function has a race condition that can cause a NULL pointer dereference. This issue has been resolved by reordering the function to call nvmet_req_bio_put() before nvmet_req_complete(). Affected versions include Linux kernel versions 6.12.37 through 6.12.69, 6.15.6 through 6.16, and others. The vulnerability has a CVSS score of 7.5 and is considered HIGH severity. Linux kernel developers and administrators responsible for maintaining and securing Linux-based systems should assess exposure and apply patches or updates to fixed versions.

Defensive priority

Apply patch or update to fixed version; verify affected versions and configurations

Recommended defensive actions

• Apply patch or update to fixed version
• Verify affected versions and configurations
• Monitor for potential exploitation attempts
• 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source item provide details on the vulnerability, including a description of the issue and affected versions. The Linux kernel's nvmet_bio_done() function has a race condition that can cause a NULL pointer dereference. The issue has been resolved by reordering the function to call nvmet_req_bio_put() before nvmet_req_complete(). The vulnerability affects Linux kernel versions 6.12.37 through 6.12.69, 6.15.6 through 6.16, and others. Defenders should verify affected versions and configurations to prioritize patching.

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.