CVE-2026-98753

kernel: tty: tty_port: restore TTY_IO_ERROR on activation failure

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Severity

Moderate

Red Hat Product Security

4.7

CVSS 3.1

Review impact separately from score.

Published · October 18, 2026

Updated · October 23, 2026

Description

A flaw was found in the Linux kernel's TTY subsystem. A local user can cause a Denial of Service (DoS) by triggering a race condition during terminal device activation and hangup operations. When device activation fails, the kernel fails to restore an error flag, allowing subsequent input/output operations on powered-down or deregistered ports. This improper access can trigger a null-pointer dereference or unclocked hardware access, resulting in a kernel crash.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 4.7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-366 · Race Condition within a Thread