nvmet: fix NULL pointer dereference in nvmet_execute_identify_ns_zns()

Summary

In the Linux kernel, the following vulnerability has been resolved: nvmet: fix NULL pointer dereference in nvmet_execute_identify_ns_zns() When a host issues an Identify command with CNS 05h (I/O Command Set specific Identify Namespace) and CSI 02h (ZNS) targeting a file-backed namespace, nvmet_execute_identify_ns_zns() calls bdev_is_zoned() on req->ns->bdev. A file-backed namespace has no block device, so req->ns->bdev is NULL and bdev_is_zoned() dereferences it, oopsing. The I/O command set is selected by the host-supplied CSI field and the command is routed here whenever CONFIG_BLK_DEV_ZONED is enabled, independent of the namespace backing type, so any file-backed namespace is exposed. Reject the command with Invalid Field when the namespace is not backed by a block device.

Timeline

1. Sep 17, 2026, 4:07 PM UTCCVE published
2. Oct 19, 2026, 9:00 AM UTCRecord last updated

Affected versions

• Linux Linux

  From aaf2e048af2704da5869f27b508b288f36d5c7b7 · fixed in 1ce8faf90eb0bf5599b90db38500aefea9426485; From aaf2e048af2704da5869f27b508b288f36d5c7b7 · fixed in b873099944dae5702b4b6db6814d1f1e8d4cfb00; From aaf2e048af2704da5869f27b508b288f36d5c7b7 · fixed in ff28a93a895912010a7827a0e1445ebe8be53b4d; From aaf2e048af2704da5869f27b508b288f36d5c7b7 · fixed in cc29f7082b7ab5e0337f27d1fef16359f05fcffa; From aaf2e048af2704da5869f27b508b288f36d5c7b7 · fixed in 1fb1236312ee1a600de6b3ca560f0b3fd5a50471; From aaf2e048af2704da5869f27b508b288f36d5c7b7 · fixed in 0b4cf43f9ca7118590a338de900edbd6047cd89f; From aaf2e048af2704da5869f27b508b288f36d5c7b7 · fixed in f594863967d87b7fcbff6e724d51135fd701a13d

• Linux Linux

  5.14

• KernelLinux

  From 5.14.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 7