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CVE-2026-89742— rapidio: mport_cdev: fix use-after-free in dma_req_free()

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，已修复以下漏洞： rapidio: mport_cdev: 修复 dma_req_free() 中的释放后使用（use-after-free）问题 函数通过 获取 互斥锁，随后调用 释放映射引用，之后再次解引用 以解锁互斥锁。 如果 释放了最后一个引用， 会释放该映射对象，而随后的 会对已释放的对象进行解引用。这构成了一个释放后使用（use-after-free）漏洞。 修复方法是：在调用 之前，预先缓存 和 指针；在持有 锁期间将 置空；并在解锁互斥锁时使用缓存的 。 该漏洞可通过用户态通

AI Predicted 5.5 Difficulty: Moderate

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux e8de370188d098bb49483c287b44925957c3c9b6< 9a9929ec875ff20922c90c96fd544ae8a2a61a8d affected
e8de370188d098bb49483c287b44925957c3c9b6< e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0 affected
e8de370188d098bb49483c287b44925957c3c9b6< 211c68d817a3d9dc14c0026a59da7cac30f8147e affected
e8de370188d098bb49483c287b44925957c3c9b6< 5cbef379a94b161726c5f504598bf4791d45cedc affected
4.6 affected
< 4.6 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-2026-89742

Vulnerability Information
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Vulnerability Title
rapidio: mport_cdev: fix use-after-free in dma_req_free()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rapidio: mport_cdev: fix use-after-free in dma_req_free() dma_req_free() acquires buf_mutex through req->map, drops the mapping reference with kref_put(), and then dereferences req->map again to unlock the mutex. If kref_put() drops the last reference, mport_release_mapping() frees the mapping, and the subsequent mutex_unlock() dereferences a freed object. This is a use-after-free. Fix this by caching map and md before kref_put(), clearing req->map while holding buf_mutex, and using the cached md for mutex unlocking. The bug is reachable from userspace via the RapidIO mport character device interface.
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 e8de370188d098bb49483c287b44925957c3c9b6 ~ 9a9929ec875ff20922c90c96fd544ae8a2a61a8d -
Linux Linux 4.6 -

II. Public POCs for CVE-2026-89742

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III. Intelligence Information for CVE-2026-89742

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Patches & Fixes for CVE-2026-89742 (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

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