Answer in brief
CVE-2026-89742 records a High severity (CVSS 7.8) vulnerability in rapidio: mport_cdev: fix use-after-free in dma_req_free(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e8de370188d098bb49483c287b44925957c3c9b6 <9a9929ec875ff20922c90c96fd544ae8a2a61a8d || >=e8de370188d098bb49483c287b44925957c3c9b6 <e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0 || >=e8de370188d098bb49483c287b44925957c3c9b6 <211c68d817a3d9dc14c0026a59da7cac30f8147e || >=e8de370188d098bb49483c287b44925957c3c9b6 <5cbef379a94b161726c5f504598bf4791d45cedc | 9a9929ec875ff20922c90c96fd544ae8a2a61a8d, e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0, 211c68d817a3d9dc14c0026a59da7cac30f8147e, 5cbef379a94b161726c5f504598bf4791d45cedc |
| Linux/Linuxgeneric | 4.6 | Not reported |
| Linux/Linuxgeneric | >=e8de370188d098bb49483c287b44925957c3c9b6 <00c5ed913b0dc563fbeb8a97ea8916c03bbbbf6a || >=e8de370188d098bb49483c287b44925957c3c9b6 <fc79c07cdcde02c5b17633d78777de6ac2c14b29 || >=e8de370188d098bb49483c287b44925957c3c9b6 <26ccfe7d69e27b0d933ae0a64a23a0cb9b9a85a6 || >=e8de370188d098bb49483c287b44925957c3c9b6 <bd8881c24a9520f9c3d3e855d866197f63e471a7 || >=e8de370188d098bb49483c287b44925957c3c9b6 <9a9929ec875ff20922c90c96fd544ae8a2a61a8d || >=e8de370188d098bb49483c287b44925957c3c9b6 <e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0 || >=e8de370188d098bb49483c287b44925957c3c9b6 <211c68d817a3d9dc14c0026a59da7cac30f8147e || >=e8de370188d098bb49483c287b44925957c3c9b6 <5cbef379a94b161726c5f504598bf4791d45cedc | 00c5ed913b0dc563fbeb8a97ea8916c03bbbbf6a, fc79c07cdcde02c5b17633d78777de6ac2c14b29, 26ccfe7d69e27b0d933ae0a64a23a0cb9b9a85a6, bd8881c24a9520f9c3d3e855d866197f63e471a7, 9a9929ec875ff20922c90c96fd544ae8a2a61a8d, e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0, 211c68d817a3d9dc14c0026a59da7cac30f8147e, 5cbef379a94b161726c5f504598bf4791d45cedc |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.