CVE-2026-53301: Amlogic T7 Linux Kernel Null Pointer Dereference

Technical summary

CVE-2026-53301 is a null pointer dereference (CWE-476) in the Linux kernel's Amlogic T7 reset driver. The reset ops structure is not populated, causing a null dereference when reset operations are invoked. The vulnerability carries a CVSS 3.1 score of 5.5 (Medium severity) with a local attack vector, requiring user-level privileges and no user interaction. The impact is limited to availability—the system experiences a denial of service through kernel panic—with no confidentiality or integrity compromise. The defect is particularly subtle because the T7 reset subsystem is not currently utilized by default, which may have delayed detection.

Business impact

For organizations running Amlogic T7-based systems (primarily edge devices, set-top boxes, or embedded Linux deployments), this vulnerability creates a stability risk. If the reset driver is enabled or activated in a custom kernel configuration, it can trigger unplanned system crashes and service interruptions. The impact is primarily operational rather than data-oriented: no data theft or corruption, but loss of availability. Organizations with critical device deployments that depend on system stability should prioritize patching. The low current usage of this specific reset driver may provide a window for proactive remediation before wide-scale activation.

Affected systems

This vulnerability affects the Linux kernel across all versions that include the Amlogic T7 reset driver code. The primary affected platforms are systems based on Amlogic T7 SOCs, commonly found in certain set-top boxes, smart TV chipsets, and embedded Linux devices. Standard desktop and server Linux distributions are not impacted unless they explicitly support or include Amlogic T7 hardware drivers. Organizations should check whether their kernel configurations enable the reset subsystem for Amlogic T7 platforms.

Exploitability

Exploitation requires local system access and user-level privileges; remote exploitation is not feasible. Triggering the vulnerability demands that an attacker or misconfigured application actively invoke the reset operations through the kernel interface. The attack surface is limited by the fact that the T7 reset driver is not enabled by default in most Linux distributions. However, any system where the reset subsystem is active or where reset operations are accessible to unprivileged users becomes vulnerable. The barrier to exploitation is low once access is gained, making it a risk for multi-user or untrusted-environment systems.

Remediation

Apply the kernel patch that implements the missing reset ops for the Amlogic T7 driver. This fix populates the reset operations structure with the appropriate handlers, eliminating the null pointer dereference. Systems should update to a patched kernel version once available from their distribution or vendor. Until patching is possible, organizations can mitigate by disabling the Amlogic T7 reset driver in kernel configuration if the platform does not require it, or by restricting access to reset operations through user privilege controls.

Patch guidance

Monitor your Linux distribution (Fedora, Ubuntu, Debian, CentOS, or other) for kernel updates that address this CVE. Verify patch availability in vendor advisories for Amlogic T7-based device manufacturers. When applying patches, test in a non-production environment first to confirm system stability. If you maintain a custom kernel build, apply the upstream Linux kernel fix that implements the reset ops initialization. Coordinate with device manufacturers or ODMs if you rely on proprietary kernel branches that may lag upstream patches.

Detection guidance

Review kernel configurations and logs for references to Amlogic T7 reset driver activity. Systems logging kernel panics or oops messages involving amlogic reset structures should be flagged for immediate inspection. Monitor for any user attempts to access reset subsystem interfaces on systems where this driver is active. Kernel debuggers and crash dump analysis can confirm null pointer dereferences originating from the reset driver. Organizations can audit running kernel modules with 'lsmod' to identify whether reset_amlogic or related modules are loaded.

Why prioritize this

Although the CVSS score is Medium (5.5), the practical risk is lower than the score suggests due to limited default activation and the requirement for local access. However, prioritization should increase if your organization deploys Amlogic T7 devices or if security hygiene demands regular, proactive kernel patching. The defect is straightforward to fix, and patches should be applied as part of normal maintenance cycles. Organizations with device fleets or embedded systems should prioritize verification of their kernel configurations and prompt application of patches once available.

Risk score, explained

The CVSS 3.1 score of 5.5 reflects a local attack vector (AV:L) requiring user privileges (PR:L) and no user interaction (UI:N). The impact is isolated to availability (A:H), with no confidentiality or integrity loss (C:N, I:N). The Medium severity is appropriate for a kernel crash that affects only local users with existing system access. The score does not account for the fact that the vulnerable code path is not enabled by default, which in practice reduces exploitability. For organizations without Amlogic T7 hardware, the risk is effectively zero.

Frequently asked questions