CVE-2025-70293 Denx CVE debrief

Who should care

Users and administrators of Denx U-Boot, especially those using versions before 2026.04, should be aware of this vulnerability. This includes operators of systems that utilize U-Boot for secure boot, as well as security teams responsible for vulnerability management in environments where U-Boot is deployed. The vulnerability's impact on system security is critical, given the potential for arbitrary code execution and denial-of-service attacks. Affected organizations should prioritize assessment and remediation efforts to mitigate potential risks.

Technical summary

The Denx U-Boot ext4fs_get_bgdtable function is vulnerable to an integer overflow, which can lead to under-allocation and arbitrary code execution. This issue was discovered in versions before 2026.04. The vulnerability affects the handling of ext4 filesystems within U-Boot, potentially allowing attackers to execute arbitrary code or cause denial-of-service conditions. The technical impact is significant, as it could be used to compromise the integrity of systems relying on U-Boot for booting or other critical functions.

Defensive priority

High

Recommended defensive actions

• Inventory and assess U-Boot installations for potential exposure
• Apply patches or updates when available
• Monitor for suspicious activity
• Implement compensating controls
• Review and verify U-Boot versions in use
• Track exceptions and retest remediated assets
• Confirm whether affected product deployments exist in managed environments

Evidence notes

The CVE record and NVD entry provide details on the integer overflow vulnerability in Denx U-Boot. However, further information about affected products and vendor remediation is limited. Affected systems may include those using U-Boot versions before 2026.04, particularly in environments where Denx U-Boot is utilized for secure boot or other high-integrity applications. Defenders should verify U-Boot versions, assess exposure, and monitor for suspicious activity related to ext4 filesystem operations.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.