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.
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= e8de370188d098bb49483c287b44925957c3c9b6, < 00c5ed913b0dc563fbeb8a97ea8916c03bbbbf6a; >= e8de370188d098bb49483c287b44925957c3c9b6, < fc79c07cdcde02c5b17633d78777de6ac2c14b29; >= e8de370188d098bb49483c287b44925957c3c9b6, < 26ccfe7d69e27b0d933ae0a64a23a0cb9b9a85a6; >= e8de370188d098bb49483c287b44925957c3c9b6, < bd8881c24a9520f9c3d3e855d866197f63e471a7; >= e8de370188d098bb49483c287b44925957c3c9b6, < 9a9929ec875ff20922c90c96fd544ae8a2a61a8d; >= e8de370188d098bb49483c287b44925957c3c9b6, < e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0; >= e8de370188d098bb49483c287b44925957c3c9b6, < 211c68d817a3d9dc14c0026a59da7cac30f8147e; >= e8de370188d098bb49483c287b44925957c3c9b6, < 5cbef379a94b161726c5f504598bf4791d45cedc |
| Linux | Linux | 4.6 |
References
- https://git.kernel.org/stable/c/00c5ed913b0dc563fbeb8a97ea8916c03bbbbf6a
- https://git.kernel.org/stable/c/211c68d817a3d9dc14c0026a59da7cac30f8147e
- https://git.kernel.org/stable/c/26ccfe7d69e27b0d933ae0a64a23a0cb9b9a85a6
- https://git.kernel.org/stable/c/5cbef379a94b161726c5f504598bf4791d45cedc
- https://git.kernel.org/stable/c/9a9929ec875ff20922c90c96fd544ae8a2a61a8d
- https://git.kernel.org/stable/c/bd8881c24a9520f9c3d3e855d866197f63e471a7
- https://git.kernel.org/stable/c/e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0
- https://git.kernel.org/stable/c/fc79c07cdcde02c5b17633d78777de6ac2c14b29
Timeline
- Published
- Sep 11, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Received