In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix path resolution in ksmbd_vfs_kern_path_create
The SMB2 open lookup is rooted at the share with LOOKUP_BENEATH, but the create/mkdir/hardlink sink is not: ksmbd_vfs_kern_path_create() builds an absolute path with convert_to_unix_name() and resolves it from AT_FDCWD via start_creating_path(), so a ".." component is walked from the real filesystem root and escapes the export.
An authenticated client races a missing path component so the rooted open lookup returns -ENOENT (taking the create branch) while the same component is present (a directory) when the create walk runs; the create then resolves ".." out of the share.
Root the create walk at the share like the lookup and rename paths already are: resolve the parent with vfs_path_parent_lookup(..., LOOKUP_BENEATH, &share_conf->vfs_path) and create the final component with start_creating_noperm(). convert_to_unix_name() then has no callers and is removed.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Aug 11, 2026 | Aug 11, 2026 |
| Ubuntu | — | Upgrade linux-image-azure-fdeUpgrade linux-image-oem-26.04aUpgrade linux-image-raspi-7.0Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-7.0.0-1013-gcpUpgrade linux-image-6.8.0-1035-nvidia-tegraNo solution existsUpgrade linux-image-realtime-64kUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-7.0.0-1020-raspiUpgrade linux-image-7.0.0-1013-aws-64kUpgrade linux-image-realtimeUpgrade linux-image-7.0.0-1014-ibmUpgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-1020-raspi-realtimeUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-virtual-7.0Upgrade linux-image-oracleUpgrade linux-image-generic-7.0Upgrade linux-image-awsUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-gke-64kUpgrade linux-image-7.0.0-1007-gkeUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-azure-7.0Upgrade linux-image-raspi-realtime-7.0Upgrade linux-image-6.8.0-1035-nvidia-tegra-rtUpgrade linux-image-azure-lts-26.04Upgrade linux-image-realtime-7.0Upgrade linux-image-azure-fde-7.0Upgrade linux-image-7.0.0-34-realtime-64kUpgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-ibmUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-7.0.0-34-genericUpgrade linux-image-virtualUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-7.0.0-34-realtimeUpgrade linux-image-azureUpgrade linux-image-7.0.0-1007-gke-64kUpgrade linux-image-7.0.0-1017-azureUpgrade linux-image-gcpUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-7.0.0-1012-oracle-64kUpgrade linux-image-generic-64k-7.0Upgrade linux-image-aws-64k-7.0Upgrade linux-image-aws-64kUpgrade linux-image-7.0.0-1013-gcp-64kUpgrade linux-image-7.0.0-1013-awsUpgrade linux-image-azure-fde-lts-26.04Upgrade linux-image-7.0.0-1016-azure-fdeUpgrade linux-image-oracle-64kUpgrade linux-image-gke-7.0Upgrade linux-image-gkeUpgrade linux-image-gcp-64kUpgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-34-generic-64kUpgrade linux-image-7.0.0-1012-oracleUpgrade linux-image-oem-7.0Upgrade linux-image-generic-64kUpgrade linux-image-7.0.0-1014-oemUpgrade linux-image-oracle-7.0Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-oem-26.04Upgrade linux-image-nvidia-tegraUpgrade linux-image-ibm-7.0Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-gke-64k-7.0Upgrade linux-image-genericUpgrade linux-image-raspi-realtimeUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-raspi | Sep 21, 2026 | Sep 18, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 17, 2026 | Aug 10, 2026 |
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