VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

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

Source GCVE Database

Authoritative record:CVE-2026-98753

Not known to be exploited · fixed in 6388409b711eb91b14fa075a4d861ccc4df1cfe7 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 6388409b711eb91b14fa075a4d861ccc4df1cfe7, 56964f6a31238fb41d5830bb42520c5b10ff7d8f, 16032c980d8f71642fcdc99309c571df3fcf3328 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-fxvh-5c26-7p3q

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4, < 6388409b711eb91b14fa075a4d861ccc4df1cfe7	Fixed in 6388409b711eb91b14fa075a4d861ccc4df1cfe7
LinuxLinux	Affected ≥ a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4, < 56964f6a31238fb41d5830bb42520c5b10ff7d8f	Fixed in 56964f6a31238fb41d5830bb42520c5b10ff7d8f
LinuxLinux	Affected ≥ a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4, < 16032c980d8f71642fcdc99309c571df3fcf3328	Fixed in 16032c980d8f71642fcdc99309c571df3fcf3328
LinuxLinux	Affected ≥ a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4, < 7021acc84c2e0add77a1a33152e3a1e428fdbfdb	Fixed in 7021acc84c2e0add77a1a33152e3a1e428fdbfdb
LinuxLinux	Affected ≥ a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4, < 34d4f67472ef7a744970b772a8565ddc727788e2	Fixed in 34d4f67472ef7a744970b772a8565ddc727788e2
LinuxLinux	Affected =2.6.33	Fixed in–

AI-suggested

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.

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.

References

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