CVE-2026-80935 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel-based systems, particularly those using the mt76 driver, should assess exposure and prioritize patching or mitigation. This includes operators, platform administrators, vulnerability management teams, and security teams who need to evaluate the potential impact on their systems and take appropriate action.

Why it matters

Defenders should care about CVE-2026-80935 because it is a potential buffer overflow vulnerability in the Linux kernel's mt76 driver. This vulnerability can lead to system instability, potential arbitrary code execution, or denial of service. Defenders responsible for Linux kernel-based systems, particularly those using the mt76 driver, should assess exposure and prioritize patching or mitigation. However, details about exploitation, impact, and remediation are limited, requiring verification from official sources.

• Potential buffer overflow and system instability
• Possible arbitrary code execution or denial of service
• Requires verification of affected versions and remediation from official sources

Technical summary

The mt7996_mcu_get_eeprom function in the Linux kernel's mt76 driver does not properly validate the destination address of the EFUSE/EXT block copy. This can lead to an out-of-bounds write of up to MT7996_EXT_EEPROM_BLOCK_SIZE bytes past the eeprom.data buffer. A malicious or malfunctioning device can report an arbitrary address to trigger this vulnerability, potentially causing buffer overflow and system instability. Defenders should prioritize patching or mitigating this vulnerability in Linux kernel versions that use the affected mt76 driver.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability in Linux kernel versions that use the affected mt76 driver, as it can lead to potential buffer overflow and system instability.

Recommended defensive actions

• Patch or update Linux kernel versions that use the affected mt76 driver
• Implement bounds checking and input validation for device EEPROM addresses
• Monitor system logs for potential buffer overflow attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source references indicate a potential buffer overflow vulnerability in the Linux kernel's mt76 driver. However, details about exploitation, impact, and remediation are limited. Defenders should verify affected versions, assess exposure, and prioritize patching or mitigation based on official sources and limited available information.

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.