CVE-2026-47335 is a vulnerability in Ubuntu Linux kernel 6.8 where a NULL pointer dereference occurs during the processing of AppArmor notifications. This flaw can be exploited by an unprivileged local attacker to cause a kernel panic, resulting in denial of service. The issue is one among multiple kernel vulnerabilities fixed in the Ubuntu Linux kernel, including memory leaks, use-after-free, out-of-bounds reads, and race conditions related to AppArmor and other kernel subsystems. The vendor has released patches for affected kernel versions, and a system reboot is required after updating to apply the fixes.

An unprivileged local attacker can trigger a NULL pointer dereference in the kernel's AppArmor notification handling, causing a kernel panic and thus a denial of service condition. There is no indication from the advisory that confidentiality or integrity are impacted by this specific vulnerability. The impact is limited to availability disruption on affected Ubuntu Linux kernel 6.8 versions.

A patch is available from Ubuntu as part of their security updates (USN-8373-1 and USN-8393-1). Users should apply the latest kernel updates for their Ubuntu Linux 6.8 installations and reboot the system to ensure the fixes take effect. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be necessary. Follow the vendor's official update instructions and verify the system is running the patched kernel versions.