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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-98753

tty: tty_port: restore TTY_IO_ERROR on activation failureCVE-2026-98753

Answer in brief

CVE-2026-98753 records a Unknown severity vulnerability in tty: tty_port: restore TTY_IO_ERROR on activation failure. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 18, 2026Updated Oct 21, 2026Source checked Oct 25, 2026First seen by HOL Oct 18, 2026Material review Oct 21, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 <34d4f67472ef7a744970b772a8565ddc727788e2 || >=a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 <7021acc84c2e0add77a1a33152e3a1e428fdbfdb || >=a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 <6388409b711eb91b14fa075a4d861ccc4df1cfe7 || >=a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 <56964f6a31238fb41d5830bb42520c5b10ff7d8f34d4f67472ef7a744970b772a8565ddc727788e2, 7021acc84c2e0add77a1a33152e3a1e428fdbfdb, 6388409b711eb91b14fa075a4d861ccc4df1cfe7, 56964f6a31238fb41d5830bb42520c5b10ff7d8f
Linux/Linuxgeneric2.6.33Not reported
Linux/Linuxgeneric>=a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 <16032c980d8f71642fcdc99309c571df3fcf3328 || >=a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 <34d4f67472ef7a744970b772a8565ddc727788e2 || >=a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 <7021acc84c2e0add77a1a33152e3a1e428fdbfdb || >=a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 <6388409b711eb91b14fa075a4d861ccc4df1cfe7 || >=a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 <56964f6a31238fb41d5830bb42520c5b10ff7d8f16032c980d8f71642fcdc99309c571df3fcf3328, 34d4f67472ef7a744970b772a8565ddc727788e2, 7021acc84c2e0add77a1a33152e3a1e428fdbfdb, 6388409b711eb91b14fa075a4d861ccc4df1cfe7, 56964f6a31238fb41d5830bb42520c5b10ff7d8f

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 34d4f67472ef7a744970b772a8565ddc727788e2; Linux/Linux to 16032c980d8f71642fcdc99309c571df3fcf3328 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 18, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 18, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Oct 25, 2026
References
5 linked sources
Open source record