{"id":"CVE-2026-89740","title":"kernel: serial: imx: serialize imx_uart_ports[] lifetime (CVE-2026-89740)","summary":"A flaw was found in the Linux kernel's `serial: imx` component. The `imx_uart_probe()` function publishes a device-managed allocated port in the `imx_uart_ports[]` array before it is fully added. If the port addition fails or the port is r…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-825","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T11:02:44+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89740.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89740.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89740"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532424"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89740"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89740"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89740.mbox"},{"url":"https://git.kernel.org/stable/c/681696ae9e4a28bdf54893c807dfe4a6c08e30a5"},{"url":"https://git.kernel.org/stable/c/28b932202fcdbeb2ef58d89ce4363f480433c234"},{"url":"https://git.kernel.org/stable/c/7429dce56a73bc080a8c072edb167106f73a08ae"},{"url":"https://git.kernel.org/stable/c/8b0b29fdcb47907ae0296b8fe829e918e05e300f"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.002,"epssPercentile":0.10122,"ingestedAt":"2026-09-14T11:11:19.884Z","slug":"CVE-2026-89740","body":"## Overview\n\nA flaw was found in the Linux kernel's `serial: imx` component. The `imx_uart_probe()` function publishes a device-managed allocated port in the `imx_uart_ports[]` array before it is fully added. If the port addition fails or the port is removed, the entry in the array is not properly cleared, resulting in a dangling pointer. This stale entry can then be used by a sibling probe to register a shared console, potentially leading to memory corruption and system instability or a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89740.json)\n\n**kernel: serial: imx: serialize imx_uart_ports[] lifetime** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":203906,"id":"CVE-2026-89740","ts":1789490220279,"field":"cvss","old":null,"new":"5.5"},{"seq":203905,"id":"CVE-2026-89740","ts":1789490220279,"field":"severity","old":"none","new":"medium"},{"seq":147211,"id":"CVE-2026-89740","ts":1789270201549,"field":"cvss","old":null,"new":"6.3"},{"seq":147210,"id":"CVE-2026-89740","ts":1789270201549,"field":"severity","old":"none","new":"medium"},{"seq":108966,"id":"CVE-2026-89740","ts":1789183729766,"field":"cvss","old":null,"new":"6.3"},{"seq":108965,"id":"CVE-2026-89740","ts":1789183729766,"field":"severity","old":"none","new":"medium"}]}