CVE-2026-80999 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel and Realtek DSA driver deployments, especially in systems where the reset GPIO is provided by a sleeping controller, should assess exposure and prioritize verification.

Why it matters

Defenders should assess exposure and prioritize verification of Linux kernel versions and Realtek DSA driver usage, especially in systems where the reset GPIO is provided by a sleeping controller.

• Verification of Linux kernel versions and Realtek DSA driver usage
• Potential warnings or issues with sleeping controllers
• Remediation priority for affected systems

Technical summary

The Linux kernel vulnerability (CVE-2026-80999) relates to the use of gpiod_set_value_cansleep for reset GPIO in the Realtek DSA driver. The vulnerability has been resolved by switching to gpiod_set_value_cansleep() to prevent warnings when the reset GPIO is provided by a sleeping controller. This change ensures that the reset GPIO can be used without triggering warnings, especially in systems where the reset GPIO is provided by a sleeping controller such as an I2C I/O expander. Defenders should assess exposure and prioritize verification of Linux kernel versions and Realtek DSA driver usage.

Defensive priority

Defenders should assess exposure and prioritize verification of Linux kernel versions and Realtek DSA driver usage, especially in systems where the reset GPIO is provided by a sleeping controller.

Recommended defensive actions

• Assess Linux kernel versions and Realtek DSA driver usage
• Verify use of gpiod_set_value_cansleep() for reset GPIO
• Monitor for potential warnings or issues with sleeping controllers
• 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 corpus provide details on the Linux kernel vulnerability and its resolution. However, the corpus does not establish specific versions, exploitation, impact, or remediation beyond the use of gpiod_set_value_cansleep().

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.