In the Linux kernel, the following vulnerability has been resolved:
ksmbd: validate owner of durable handle on reconnect
Currently, ksmbd does not verify if the user attempting to reconnect to a durable handle is the same user who originally opened the file. This allows any authenticated user to hijack an orphaned durable handle by predicting or brute-forcing the persistent ID.
According to MS-SMB2, the server MUST verify that the SecurityContext of the reconnect request matches the SecurityContext associated with the existing open. Add a durable_owner structure to ksmbd_file to store the original opener's UID, GID, and account name. and catpure the owner information when a file handle becomes orphaned. and implementing ksmbd_vfs_compare_durable_owner() to validate the identity of the requester during SMB2_CREATE (DHnC).
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Ubuntu | — | Upgrade linux-image-oem-24.04dUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-oracle-64kUpgrade linux-image-nvidia-64kUpgrade linux-image-virtual-7.0Upgrade linux-image-aws-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oem-24.04cUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-ibmUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-7.0.0-1013-nvidiaUpgrade linux-image-azure-fdeUpgrade linux-image-awsUpgrade linux-image-generic-64k-7.0Upgrade linux-image-virtualUpgrade linux-image-7.0.0-27-genericUpgrade linux-image-raspi-7.0Upgrade linux-image-generic-7.0Upgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-gcpUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-oem-24.04aUpgrade linux-image-7.0.0-1007-oracle-64kUpgrade linux-image-7.0.0-1009-azure-fdeUpgrade linux-image-azure-7.0Upgrade linux-image-7.0.0-1007-oracleUpgrade linux-image-7.0.0-1014-raspiUpgrade linux-image-realtime-64kUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-oracle-7.0Upgrade linux-image-7.0.0-27-generic-64kUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-oem-24.04bUpgrade linux-image-raspiUpgrade linux-image-7.0.0-28-generic-64kUpgrade linux-image-7.0.0-1010-azureUpgrade linux-image-7.0.0-1007-gcp-64kUpgrade linux-image-7.0.0-1014-raspi-realtimeUpgrade linux-image-nvidia-7.0Upgrade linux-image-gcp-64kUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-7.0.0-1008-aws-64kUpgrade linux-image-aws-64k-7.0Upgrade linux-image-7.0.0-1008-awsUpgrade linux-image-7.0.0-1007-gcpUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-oem-24.04Upgrade linux-image-aws-7.0Upgrade linux-image-realtimeUpgrade linux-image-genericUpgrade linux-image-gcp-7.0Upgrade linux-image-azure-fde-7.0Upgrade linux-image-azureUpgrade linux-image-7.0.0-27-realtime-64kUpgrade linux-image-realtime-7.0Upgrade linux-image-ibm-7.0Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-7.0.0-1009-ibmUpgrade linux-image-oracleUpgrade linux-image-nvidiaUpgrade linux-image-7.0.0-1013-nvidia-64kUpgrade linux-image-generic-64kUpgrade linux-image-7.0.0-28-genericUpgrade linux-image-7.0.0-27-realtime | Jul 1, 2026 | May 1, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 10, 2026 | May 1, 2026 |
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