CVE-2026-89742

CVE CVE-2026-89742EUVD EUVD-2026-76654Published 2026-09-11T19:46:48.000ZLast changed 2026-09-14T12:02:25.000ZCVSS 7.8

What the advisory describes

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: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux e8de370188d098bb49483c287b44925957c3c9b6 <5cbef379a94b161726c5f504598bf4791d45cedc; e8de370188d098bb49483c287b44925957c3c9b6 <211c68d817a3d9dc14c0026a59da7cac30f8147e; patch: 7.3-rc1; patch: 6.18.50; patch: 5.15.221; e8de370188d098bb49483c287b44925957c3c9b6 <fc79c07cdcde02c5b17633d78777de6ac2c14b29; patch: 7.2.4; e8de370188d098bb49483c287b44925957c3c9b6 <26ccfe7d69e27b0d933ae0a64a23a0cb9b9a85a6; e8de370188d098bb49483c287b44925957c3c9b6 <9a9929ec875ff20922c90c96fd544ae8a2a61a8d; patch: 5.10.270; patch: 6.12.109; e8de370188d098bb49483c287b44925957c3c9b6 <00c5ed913b0dc563fbeb8a97ea8916c03bbbbf6a; patch: 0; patch: 6.1.188; e8de370188d098bb49483c287b44925957c3c9b6 <bd8881c24a9520f9c3d3e855d866197f63e471a7; e8de370188d098bb49483c287b44925957c3c9b6 <e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0; 4.6; patch: 6.6.157

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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