CVE-2026-89742

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89742

Key Details

CVE	CVE-2026-89742
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89742
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89742

Source

Reference

NVD

CVE