CVE-2026-98750 Linux CVE debrief

Who should care

Linux kernel developers, administrators responsible for maintaining and securing Linux-based systems, and security teams should assess exposure and verify kernel versions to ensure the vulnerability is not exploitable. They should also review system configurations and monitor system logs for potential exploitation attempts.

Why it matters

A use-after-free vulnerability in the Linux kernel's TTY driver has been addressed. The issue arises when a minor number is reused for a different device, and old settings prevent the port from being opened. A new TTY_DRIVER_RESET_SAVED_TERMIOS flag has been introduced to reset saved termios state on device registration. Linux kernel developers and administrators should verify kernel versions and assess system configurations to ensure the vulnerability is not exploitable.

• Verify kernel updates to ensure the TTY_DRIVER_RESET_SAVED_TERMIOS flag is utilized
• Assess system configurations for vulnerable TTY drivers
• Monitor system logs for potential exploitation attempts

Technical summary

The Linux kernel's TTY driver had a use-after-free vulnerability due to a race condition when reusing minor numbers for different devices. A new flag, TTY_DRIVER_RESET_SAVED_TERMIOS, has been introduced to reset saved termios state on device registration. Linux kernel developers and administrators should verify kernel versions and assess system configurations to ensure the vulnerability is not exploitable. The vulnerability can be addressed by utilizing the TTY_DRIVER_RESET_SAVED_TERMIOS flag and updating kernel versions.

Defensive priority

Verify and apply kernel updates to ensure the TTY_DRIVER_RESET_SAVED_TERMIOS flag is utilized.

Recommended defensive actions

• Verify kernel version and apply updates if necessary
• Review system configurations for vulnerable TTY drivers
• Monitor system logs for potential exploitation attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• technicalSummary

Evidence notes

The CVE record and NVD entry provide details on the vulnerability and its resolution. However, specific version information and exploitation details are not provided. Defenders should verify kernel versions, assess system configurations, and monitor system logs for potential exploitation attempts. The TTY_DRIVER_RESET_SAVED_TERMIOS flag is utilized in the Linux kernel to reset saved termios state on device registration, addressing the use-after-free vulnerability.

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.