In the Linux kernel, the following vulnerability has been resolved:
apparmor: fix unconfined user namespace restriction forced stack
If a task is already confined by a stack the unprivileged transition restriction on unconfined is not correctly, applied. This results in an escape if two transitions through an unconfined profile can be executed.
Fix this by pushing the check into the per profile label build. The check will always be done against unconfined and result in a stack of just the unconfined component when necessary.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Nov 3, 2026 | Sep 17, 2026 |
| Ubuntu | — | Upgrade linux-oem-7.0Upgrade linuxUpgrade linux-riscv-7.0Upgrade linux-riscvUpgrade linux-hwe-7.0Upgrade linux-awsUpgrade linux-gcpUpgrade linux-oracleUpgrade linux-ibm | Nov 3, 2026 | Sep 17, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 28, 2026 | Sep 17, 2026 |
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