In the Linux kernel, the following vulnerability has been resolved: tty: tty_port: restore TTY_IO_ERROR on activation failure Make sure to restore… (CVE-2026-98753)
Description
A vulnerability in the Linux kernel's tty subsystem was resolved by ensuring the TTY_IO_ERROR flag is restored on activation failure. Without this fix, there is a risk of kernel panic or NULL-pointer dereferences due to I/O attempts on powered down or deregistered ports during races between ioctl, hangup, and open operations.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel vulnerability (CVE-2026-98753) involves the tty_port component where the TTY_IO_ERROR flag was not restored upon activation failure. This omission allowed a window during which drivers could attempt I/O on ports that were gone or powered down, potentially causing kernel panics or NULL-pointer dereferences. The fix ensures the TTY_IO_ERROR flag is restored immediately on activation failure, preventing unsafe I/O attempts and race conditions involving ioctl and hangup operations.
Potential Impact
If unpatched, this vulnerability could lead to kernel panics or NULL-pointer dereferences when accessing powered down or deregistered tty ports, potentially causing system instability or denial of service. There is no indication of remote code execution or privilege escalation from the provided data.
Mitigation Recommendations
A fix has been applied to the Linux kernel to restore the TTY_IO_ERROR flag on activation failure. Users should update to the fixed kernel version once available. No additional mitigation steps are indicated in the advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-fxvh-5c26-7p3q
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-98753"]
Threat ID: 6ad520ab2cdf04f6569939b9
Added to database: 10/18/2026, 19:40:27 UTC
Last enriched: 10/18/2026, 22:22:29 UTC
Last updated: 10/18/2026, 22:22:29 UTC
Views: 2
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