VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98749: Linux kernel · tty: serial: max3100: shut down timer before freeing port

Source GCVE Database

Authoritative record:CVE-2026-98749

Not known to be exploited · fixed in fb668620e3b163962dabe1a674725a07aa44ff4a : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in fb668620e3b163962dabe1a674725a07aa44ff4a, db0949bbd06db0a75b4b1076f1e25194be7d956a, 247b8f680876313586aed4d267bfcceddc2b4901 +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-ghhr-fv6h-x88w

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7831d56b0a3544cbb6f82f76c34ca95e24d5b676, < fb668620e3b163962dabe1a674725a07aa44ff4a	Fixed in fb668620e3b163962dabe1a674725a07aa44ff4a
LinuxLinux	Affected ≥ 7831d56b0a3544cbb6f82f76c34ca95e24d5b676, < db0949bbd06db0a75b4b1076f1e25194be7d956a	Fixed in db0949bbd06db0a75b4b1076f1e25194be7d956a
LinuxLinux	Affected ≥ 7831d56b0a3544cbb6f82f76c34ca95e24d5b676, < 247b8f680876313586aed4d267bfcceddc2b4901	Fixed in 247b8f680876313586aed4d267bfcceddc2b4901
LinuxLinux	Affected ≥ 7831d56b0a3544cbb6f82f76c34ca95e24d5b676, < 158a07da2da720f2f98b4bea129212c6805d8ee0	Fixed in 158a07da2da720f2f98b4bea129212c6805d8ee0
LinuxLinux	Affected ≥ 7831d56b0a3544cbb6f82f76c34ca95e24d5b676, < 2c8614981d3e6e000427de0ab2426ab68274d850	Fixed in 2c8614981d3e6e000427de0ab2426ab68274d850
LinuxLinux	Affected =2.6.30	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to properly shut down the timer and clean up resources in the max3100 serial driver. Users should update to a kernel version that includes this fix. Since this is a kernel-level issue, applying the official kernel patch or upgrading to a fixed kernel release is the recommended remediation.

Description

A use-after-free vulnerability in the Linux kernel's max3100 serial driver was resolved. The issue occurs because the polling timer is not properly shut down before the port is freed, potentially allowing the timer callback to access freed memory. The fix involves adding final timer teardown in the remove function, synchronizing timer shutdown, freeing the IRQ, and destroying the workqueue to prevent race conditions.

References

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