tty: tty_port: restore TTY_IO_ERROR on activation failure
CVSS score
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EPSS probability
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Risk score
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Published
10 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%63
Short explanation
The tty_port component in the Linux kernel fails to restore the TTY_IO_ERROR flag when activation fails. This creates race conditions that prevent I/O attempts on gone or powered down ports, potentially triggering kernel panic and other stability issues.
Failing to restore the TTY_IO_ERROR flag during activation failures leaves a window where drivers fail to handle ioctl-hangup races, leading to kernel panics.
What should be done?
- Follow the vendor advisories for the Linux kernel.
- Review the stable update commit references.
- Update the system to supported stable versions.
Chain of evidence and sources
Linux çekirdeğindeki tty_port bileşeni, aktivasyon başarısız olduğunda TTY_IO_ERROR bayrağını geri yüklememektedir.
Bu eksiklik, tty ioctl işlemlerinin kapanma ve açılma ile yarışması durumunda çekirdek paniğine neden olabilir.
Show the technical text from the sources
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.
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
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| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98753 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98753 weaknesses.
Official Sources and Advisories
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