CVE-2026-23148

A race condition vulnerability was found in the NVMe target (nvmet) subsystem. In nvmet_bio_done(), the bio completion callback can re-queue and re-submit a request using the same inline_bio before bio_uninit() is called. When bio_uninit() subsequently sets bio->bi_blkg to NULL, the re-submitted bio causes a NULL pointer dereference in blk_cgroup_bio_start().

This vulnerability affects systems running as NVMe-oF (NVMe over Fabrics) targets. Exploitation requires specific timing between bio completion and re-submission, making it difficult to trigger reliably. The impact is denial of service via kernel crash rather than privilege escalation.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.