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CVE-2026-89740— serial: imx: serialize imx_uart_ports[] lifetime

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已修复： serial: imx: 序列化 imx_uart_ports[] 的生命周期 在调用 之前，就在 中发布了通过 分配的设备端口，原因是控制台初始化需要使用该表。当添加端口失败或设备被移除后，该条目未被清除，导致出现悬空指针。 一个兄弟设备的探测流程可能会通过这个过时的条目注册共享控制台。此问题已在 QEMU 的 mcimx6ul-evk 平台上，通过 KASAN 复现：先解绑某个兄弟 UART，再解绑控制台 UART，随后重新绑定该兄弟 UART。 修复措施包括： 在 执

AI Predicted 4.4 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1221 · Template Injection

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux dbff4e9ea2e83fda89143389bfb229cb29425a32< 681696ae9e4a28bdf54893c807dfe4a6c08e30a5 affected
dbff4e9ea2e83fda89143389bfb229cb29425a32< 28b932202fcdbeb2ef58d89ce4363f480433c234 affected
dbff4e9ea2e83fda89143389bfb229cb29425a32< 7429dce56a73bc080a8c072edb167106f73a08ae affected
dbff4e9ea2e83fda89143389bfb229cb29425a32< 8b0b29fdcb47907ae0296b8fe829e918e05e300f affected
2.6.27 affected
< 2.6.27 unaffected
6.12.109≤ 6.12.* unaffected
6.18.50≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-89740

Vulnerability Information
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Vulnerability Title
serial: imx: serialize imx_uart_ports[] lifetime
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux dbff4e9ea2e83fda89143389bfb229cb29425a32 ~ 681696ae9e4a28bdf54893c807dfe4a6c08e30a5 -
Linux Linux 2.6.27 -

II. Public POCs for CVE-2026-89740

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III. Intelligence Information for CVE-2026-89740

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Patches & Fixes for CVE-2026-89740 (4)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89477 sctp: fix NULL deref on untransmitted RECONF completion
CVE-2026-89478 sctp: drop a chunk if its transport was removed
CVE-2026-89479 sctp: stop processing a packet once its association is deleted
CVE-2026-89480 nvme-tcp: reject a read that transferred too few bytes
CVE-2026-89482 nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89481 nvme-tcp: fix host memory disclosure on R2T for a read command
CVE-2026-89483 nvme: zero the discard fallback page
CVE-2026-89484 lockd: fix NULL dereference on lockowner allocation failure
CVE-2026-89485 lockd: pin next file across nlm_inspect_file lock-drop
CVE-2026-89486 ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
CVE-2026-89487 openvswitch: only skb_tx_error() a packet we are about to drop
CVE-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89500 ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
CVE-2026-89497 orangefs: skip leading spaces before parsing client debug masks
CVE-2026-89498 orangefs: fix double-free of trailer_buf on readdir copy failure
CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails
CVE-2026-89496 ocfs2: always run deallocs on copy-on-write completion
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89740

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