CVE-2026-89742High· 7.8▾ TwilightIn 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 der…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 6.4
none → medium
— → 6.4
none → medium
— → 7.8
none → high
7.8 → 6.4
high → medium
7.8 → 5.5
high → medium
Last analysed / modified upstream
5.5 → 7.8
medium → high
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.
Linux >= e8de370188d098bb49483c287b44925957c3c9b6 < 00c5ed913b0dc563fbeb8a97ea8916c03bbbbf6aLinux >= e8de370188d098bb49483c287b44925957c3c9b6 < fc79c07cdcde02c5b17633d78777de6ac2c14b29Linux >= e8de370188d098bb49483c287b44925957c3c9b6 < 26ccfe7d69e27b0d933ae0a64a23a0cb9b9a85a6Linux >= e8de370188d098bb49483c287b44925957c3c9b6 < bd8881c24a9520f9c3d3e855d866197f63e471a7Linux >= e8de370188d098bb49483c287b44925957c3c9b6 < 9a9929ec875ff20922c90c96fd544ae8a2a61a8dLinux >= e8de370188d098bb49483c287b44925957c3c9b6 < e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0Linux >= e8de370188d098bb49483c287b44925957c3c9b6 < 211c68d817a3d9dc14c0026a59da7cac30f8147eLinux >= e8de370188d098bb49483c287b44925957c3c9b6 < 5cbef379a94b161726c5f504598bf4791d45cedcLinux 4.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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