CVE-2026-53045

What it actually does

This is a Linux kernel defect in the NVIDIA Tegra124 external memory controller driver. The driver incorrectly interpreted the EMRS register bit that indicates whether the memory DLL is enabled: the logic was reversed, so the kernel could make the wrong decision during memory timing changes. On affected Tegra124-based systems, this can result in incorrect memory-controller behavior during timing or frequency transitions, potentially causing instability, memory errors, hangs, or crashes. There is no public evidence in the provided data of a practical privilege-escalation, remote-code-execution, or data-exfiltration exploit path.

Why it matters to the business

The likely operational impact is reliability risk on affected embedded or ARM Linux systems using Tegra124 hardware: devices may become unstable, crash, or behave unpredictably during memory timing changes. The issue is not listed in CISA KEV, is not associated with ransomware use, has no known exploit maturity, and has a low EPSS score, so urgency is lower than actively exploited vulnerabilities; however, organizations shipping or operating Tegra124-based Linux devices should still plan kernel updates because kernel memory-controller defects can affect availability and device trustworthiness.

How an attack unfolds

No public exploit path is indicated by the supplied intelligence. A plausible abuse scenario would require an attacker to already have a meaningful local foothold or a way to trigger memory timing or power-management transitions on a Tegra124-based Linux system. By repeatedly inducing conditions that exercise the affected memory-controller timing logic, an attacker might be able to provoke system instability, crashes, or data corruption. Because the bug is in hardware-specific kernel driver logic rather than an exposed network parser or common user-facing service, exploitation is expected to be platform-specific and difficult to weaponize without local access and detailed knowledge of the target hardware and kernel configuration.

How to fix it

Apply a Linux kernel update that includes the upstream fix for the Tegra124 EMC DLL enablement check. If using a vendor-supplied BSP, embedded Linux distribution, Android-derived kernel, or long-term-support kernel, obtain the patched kernel from the device, silicon, or distribution vendor. Where immediate patching is not possible, reduce exposure by limiting untrusted local access, disabling unnecessary interfaces that allow local code execution, and reviewing power-management or dynamic frequency-scaling settings for affected devices if operationally feasible. No exact fixed package versions were provided in the input, so remediation should be tracked by kernel commit inclusion or vendor advisory coverage rather than package version alone.

How to confirm the fix worked

Confirm whether systems are affected by verifying that they run Linux on Tegra124-class hardware and include the tegra124-emc memory controller driver. Validate remediation by confirming the running kernel contains the corrected logic for the EMRS DLL check, where DLL is treated as enabled when bit A0 is low. Practically, this can be done by checking the vendor kernel changelog, distribution security advisory, or source tree for the tegra124-emc fix, then confirming the patched kernel is booted on the device. After deployment, run platform stability testing that exercises suspend/resume, memory frequency changes, CPU/GPU load transitions, and other power-management paths while monitoring kernel logs for memory-controller, timing, or machine-check-like errors.

Typical attack path

1. Identify a Linux device using NVIDIA Tegra124 hardware and a vulnerable kernel containing the affected tegra124-emc driver logic.
2. Obtain local access or another capability that can influence power-management, memory-timing, or frequency-scaling behavior.
3. Trigger repeated memory timing or clock transition events that cause the incorrect DLL enablement check to be exercised.
4. Attempt to cause observable instability such as kernel warnings, memory errors, device hangs, or denial of service.
5. Use resulting instability opportunistically, if possible, to disrupt device availability; no reliable code-execution technique is indicated by the provided data.

How to detect it

There are no specific public exploitation indicators in the supplied intelligence. Detection should focus on exposure confirmation and post-event evidence of instability on affected Tegra124 Linux systems. Review asset inventory, kernel build configuration, device-tree data, boot logs, and vendor kernel versions to identify systems using the tegra124-emc driver. For possible prior impact, examine kernel logs, persistent journal data, crash dumps, watchdog-reset records, bootloader reset reasons, and hardware health telemetry for recurring memory-controller errors, timing-change failures, unexplained kernel panics, hangs, or resets around suspend/resume, dynamic frequency scaling, or high memory-load events. Because no known exploit tool, payload, network signature, or attacker campaign is associated with this issue, absence of such indicators should not be considered proof of safety; rely on kernel provenance and patch validation for exposure assessment.

What your security team should do

• Prioritize inventory first: identify whether any managed products, appliances, embedded systems, or build pipelines use Linux kernels for NVIDIA Tegra124-based hardware.
• If Tegra124 devices are present, request patched kernels or BSP updates from the relevant Linux distribution, device vendor, or silicon vendor.
• Schedule remediation through normal kernel maintenance unless the affected device supports critical operations, is safety-sensitive, or has a history of unexplained crashes, in which case accelerate testing and deployment.
• Restrict local shell, debugging, serial-console, ADB-like, and maintenance access to affected devices until patched, because any plausible exploitation would likely require local capability.
• Monitor kernel and device logs for unexplained memory-controller errors, frequency-scaling failures, hangs, watchdog resets, and panic events on Tegra124 systems.
• Do not treat this as an internet-exposed mass exploitation issue based on the current intelligence: it is not KEV-listed, has no known ransomware association, has no known exploit maturity, and has a low EPSS score.