VulnerabilityPublished 11 Sep 2026Updated 21 Oct 2026

CVE-2026-89740: Linux kernel · serial: imx: serialize imx_uart_ports[] lifetime

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in abc17fd508a511669997e48f8b014d8aa043abdf : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in abc17fd508a511669997e48f8b014d8aa043abdf, 681696ae9e4a28bdf54893c807dfe4a6c08e30a5, 7429dce56a73bc080a8c072edb167106f73a08ae +2

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Sep 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ dbff4e9ea2e83fda89143389bfb229cb29425a32, < abc17fd508a511669997e48f8b014d8aa043abdf	Fixed in abc17fd508a511669997e48f8b014d8aa043abdf
LinuxLinux	Affected ≥ dbff4e9ea2e83fda89143389bfb229cb29425a32, < 681696ae9e4a28bdf54893c807dfe4a6c08e30a5	Fixed in 681696ae9e4a28bdf54893c807dfe4a6c08e30a5
LinuxLinux	Affected ≥ dbff4e9ea2e83fda89143389bfb229cb29425a32, < 7429dce56a73bc080a8c072edb167106f73a08ae	Fixed in 7429dce56a73bc080a8c072edb167106f73a08ae
LinuxLinux	Affected ≥ dbff4e9ea2e83fda89143389bfb229cb29425a32, < 28b932202fcdbeb2ef58d89ce4363f480433c234	Fixed in 28b932202fcdbeb2ef58d89ce4363f480433c234
LinuxLinux	Affected ≥ dbff4e9ea2e83fda89143389bfb229cb29425a32, < 8b0b29fdcb47907ae0296b8fe829e918e05e300f	Fixed in 8b0b29fdcb47907ae0296b8fe829e918e05e300f
LinuxLinux	Affected =2.6.27	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: serial: imx: serialize imx_uart_ports[] lifetime imx_uart_probe() publishes its devm-allocated port in imx_uart_ports[] before uart_add_one_port() because console setup uses the table. The entry is not cleared when adding the port fails or after removal, leaving a dangling pointer. A sibling probe can register the shared console through that stale entry. This was reproduced under KASAN on QEMU mcimx6ul-evk by unbinding a sibling UART, unbinding the console UART and rebinding the sibling. Keep the entry valid through uart_remove_one_port(), then clear it. Protect port addition and removal together with their table updates so sibling operations cannot interleave. Reject an occupied slot rather than clobbering an active port during a duplicate-line probe.

References

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