VulnerabilityPublished 23 Oct 2026

CVE-2026-98883: Linux kernel · serial: 8250_port: recognize UPIO_AU

Source GCVE Database

Authoritative record:CVE-2026-98883

Not known to be exploited : upgrade to 49fa670efdfdd27e29145cbd2beef065c08717ef or 9f67997353caa29c6a080789a1fb6e01fb50c118 when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Low

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 49fa670efdfdd27e29145cbd2beef065c08717ef, 9f67997353caa29c6a080789a1fb6e01fb50c118

Exploitation evidence

Disclosed: evidence found.
CVE published 23 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.

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What to do

Upgrade Linux kernel to 49fa670efdfdd27e29145cbd2beef065c08717ef or 9f67997353caa29c6a080789a1fb6e01fb50c118.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7c7e6c8924e7bf98db4e5b2edb202842003c00c2, < 49fa670efdfdd27e29145cbd2beef065c08717ef	Fixed in 49fa670efdfdd27e29145cbd2beef065c08717ef
LinuxLinux	Affected ≥ 7c7e6c8924e7bf98db4e5b2edb202842003c00c2, < 9f67997353caa29c6a080789a1fb6e01fb50c118	Fixed in 9f67997353caa29c6a080789a1fb6e01fb50c118
LinuxLinux	Affected =6.13	Fixed in–

AI-suggested

A fix is available that updates the Linux kernel 8250 serial driver to recognize UPIO_AU (type 4) UARTs correctly. Users should apply the updated kernel version containing this fix. No additional mitigation steps are necessary as the issue is resolved by this patch.

Description

A vulnerability in the Linux kernel's 8250 serial driver related to the recognition of UPIO_AU (type 4) on MIPS Alchemy systems has been resolved. The issue caused warnings during the probe of the 8250 driver due to unsupported UART type 4. The fix involves recognizing UPIO_AU in the set_io_from_upio() function and taking no action since parameters are already set in the platform-specific setup. This fix has been tested on the Alchemy Au1300 platform.

References

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