{"id":"CVE-2026-89742","revision":"120fcbe7688b48aa8702de053bdf26ef","records":[{"revision":"120fcbe7688b48aa8702de053bdf26ef","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89742","aliases":[],"title":"rapidio: mport_cdev: fix use-after-free in dma_req_free()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrapidio: mport_cdev: fix use-after-free in dma_req_free()\n\ndma_req_free() acquires buf_mutex through req->map, drops the mapping\nreference with kref_put(), and then dereferences req->map again to unlock\nthe mutex.\n\nIf kref_put() drops the last reference, mport_release_mapping() frees the\nmapping, and the subsequent mutex_unlock() dereferences a freed object. \nThis is a use-after-free.\n\nFix this by caching map and md before kref_put(), clearing req->map while\nholding buf_mutex, and using the cached md for mutex unlocking.\n\nThe bug is reachable from userspace via the RapidIO mport character device\ninterface.","state":0,"publishedAt":"2026-09-11T19:46:48.522+00:00","modifiedAt":"2026-10-19T08:51:56.183+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/rapidio/devices/rio_mport_cdev.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"e8de370188d098bb49483c287b44925957c3c9b6\",\n                            \"lessThan\": \"00c5ed913b0dc563fbeb8a97ea8916c03bbbbf6a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e8de370188d098bb49483c287b44925957c3c9b6\",\n                            \"lessThan\": \"fc79c07cdcde02c5b17633d78777de6ac2c14b29\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e8de370188d098bb49483c287b44925957c3c9b6\",\n                            \"lessThan\": \"26ccfe7d69e27b0d933ae0a64a23a0cb9b9a85a6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e8de370188d098bb49483c287b44925957c3c9b6\",\n                            \"lessThan\": \"bd8881c24a9520f9c3d3e855d866197f63e471a7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e8de370188d098bb49483c287b44925957c3c9b6\",\n                            \"lessThan\": \"9a9929ec875ff20922c90c96fd544ae8a2a61a8d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e8de370188d098bb49483c287b44925957c3c9b6\",\n                            \"lessThan\": \"e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e8de370188d098bb49483c287b44925957c3c9b6\",\n                            \"lessThan\": \"211c68d817a3d9dc14c0026a59da7cac30f8147e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e8de370188d098bb49483c287b44925957c3c9b6\",\n                            \"lessThan\": \"5cbef379a94b161726c5f504598bf4791d45cedc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/rapidio/devices/rio_mport_cdev.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89742","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89742","identifiers":["CVE-2026-89742"]},"retained":false,"historicalAffected":[]}],"coverage":[]}