Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e8de370188d098bb49483c287b44925957c3c9b6 before 00c5ed913b0dc563fbeb8a97ea8916c03bbbbf6a; affected e8de370188d098bb49483c287b44925957c3c9b6 before fc79c07cdcde02c5b17633d78777de6ac2c14b29; affected e8de370188d098bb49483c287b44925957c3c9b6 before 26ccfe7d69e27b0d933ae0a64a23a0cb9b9a85a6; affected e8de370188d098bb49483c287b44925957c3c9b6 before bd8881c24a9520f9c3d3e855d866197f63e471a7; affected e8de370188d098bb49483c287b44925957c3c9b6 before 9a9929ec875ff20922c90c96fd544ae8a2a61a8d; affected e8de370188d098bb49483c287b44925957c3c9b6 before e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0; affected e8de370188d098bb49483c287b44925957c3c9b6 before 211c68d817a3d9dc14c0026a59da7cac30f8147e; affected e8de370188d098bb49483c287b44925957c3c9b6 before 5cbef379a94b161726c5f504598bf4791d45cedc |
| Linux / Linux | affected 4.6; unaffected 0 before 4.6; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/00c5ed913b0dc563fbeb8a97ea8916c03bbbbf6a
- https://git.kernel.org/stable/c/fc79c07cdcde02c5b17633d78777de6ac2c14b29
- https://git.kernel.org/stable/c/26ccfe7d69e27b0d933ae0a64a23a0cb9b9a85a6
- https://git.kernel.org/stable/c/bd8881c24a9520f9c3d3e855d866197f63e471a7
- https://git.kernel.org/stable/c/9a9929ec875ff20922c90c96fd544ae8a2a61a8d
- https://git.kernel.org/stable/c/e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0
- https://git.kernel.org/stable/c/211c68d817a3d9dc14c0026a59da7cac30f8147e
- https://git.kernel.org/stable/c/5cbef379a94b161726c5f504598bf4791d45cedc