What’s Vulnerable › Vulnerabilities

CVE-2026-98753: tty: tty_port: restore TTY_IO_ERROR on activation failure

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-18 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: tty: tty_port: restore TTY_IO_ERROR on activation failure Make sure to restore the TTY_IO_ERROR flag if activation fails to prevent I/O attempts on a port that is gone or powered down. This specifically avoids issues like kernel panic due to unclocked accesses or NULL-pointer dereferences when accessing powered down or deregistered ports when a TTY ioctl races with hangup and open. Note that the flag is set again in tty_port_close() but not restoring it on activation failure leaves a window where drivers fail to handle the ioctl-hangup race.

Affected products

• Linux: 2.6.33 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/16032c980d8f71642fcdc99309c571df3fcf3328
• https://git.kernel.org/stable/c/34d4f67472ef7a744970b772a8565ddc727788e2
• https://git.kernel.org/stable/c/5469dc4153a60289c5bae00215947c6ce09fcc0e
• https://git.kernel.org/stable/c/56964f6a31238fb41d5830bb42520c5b10ff7d8f
• https://git.kernel.org/stable/c/6388409b711eb91b14fa075a4d861ccc4df1cfe7
• https://git.kernel.org/stable/c/7021acc84c2e0add77a1a33152e3a1e428fdbfdb
• https://git.kernel.org/stable/c/761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2
• https://git.kernel.org/stable/c/e24625bff786fa3f22cc38b5038362b910621e83

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