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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Sep 30, 2026 | Sep 17, 2026 |
| Redhat_linux | — | No solution exists | Oct 15, 2026 | Sep 17, 2026 |
| Ubuntu | — | Upgrade linux-oracleUpgrade linux-azure-fdeUpgrade linux-azureUpgrade linux-intel-iotg-5.15Upgrade linux-ibmUpgrade linux-hwe-7.0Upgrade linux-azure-fde-5.15Upgrade linux-azure-5.15Upgrade linux-gcp-fipsUpgrade linux-aws-fipsUpgrade linux-gkeopUpgrade linux-kvmUpgrade linux-nvidiaUpgrade linux-lowlatency-hwe-5.15Upgrade linux-realtimeUpgrade linux-hwe-5.15Upgrade linux-gcp-5.15Upgrade linux-riscv-7.0Upgrade linux-awsUpgrade linux-nvidia-tegra-igxUpgrade linux-azure-fipsUpgrade linux-intel-iot-realtimeUpgrade linux-gcpUpgrade linux-oem-7.0Upgrade linux-aws-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-gkeUpgrade linux-lowlatencyUpgrade linux-riscvUpgrade linux-ibm-5.15Upgrade linux-intel-iotgUpgrade linuxUpgrade linux-nvidia-tegraUpgrade linux-bluefieldUpgrade linux-riscv-5.15Upgrade linux-oracle-5.15Upgrade linux-fips | Nov 3, 2026 | Sep 17, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 30, 2026 | Sep 17, 2026 |
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