{"id":"CVE-2025-39871","revision":"26b68f698b6e42b2bd77a8f585a42c8b","records":[{"revision":"26b68f698b6e42b2bd77a8f585a42c8b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-39871","aliases":[],"title":"dmaengine: idxd: Remove improper idxd_free","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Remove improper idxd_free\n\nThe call to idxd_free() introduces a duplicate put_device() leading to a\nreference count underflow:\nrefcount_t: underflow; use-after-free.\nWARNING: CPU: 15 PID: 4428 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\n...\nCall Trace:\n <TASK>\n  idxd_remove+0xe4/0x120 [idxd]\n  pci_device_remove+0x3f/0xb0\n  device_release_driver_internal+0x197/0x200\n  driver_detach+0x48/0x90\n  bus_remove_driver+0x74/0xf0\n  pci_unregister_driver+0x2e/0xb0\n  idxd_exit_module+0x34/0x7a0 [idxd]\n  __do_sys_delete_module.constprop.0+0x183/0x280\n  do_syscall_64+0x54/0xd70\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe idxd_unregister_devices() which is invoked at the very beginning of\nidxd_remove(), already takes care of the necessary put_device() through the\nfollowing call path:\nidxd_unregister_devices() -> device_unregister() -> put_device()\n\nIn addition, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device() may\ntrigger asynchronous cleanup via schedule_delayed_work(). If idxd_free() is\ncalled immediately after, it can result in a use-after-free.\n\nRemove the improper idxd_free() to avoid both the refcount underflow and\npotential memory corruption during module unload.","state":0,"publishedAt":"2025-09-23T06:00:44.882+00:00","modifiedAt":"2026-10-15T01:08:33.888+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/dma/idxd/init.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"68ac5a01f635b3791196fd1c39bc48497252c36f\",\n                            \"lessThan\": \"24414bbcb37e1af95190af36c21ae51d497e1a9e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d2d05fd0fc95c4defed6f7b87550e20e8baa1d97\",\n                            \"lessThan\": \"0e95ee7f532b21206fe3f1c4054002b0d21e3b9c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"21f9f5cd9a0c75084d4369ba0b8c4f695c41dea7\",\n                            \"lessThan\": \"dd7a7e43269711d757fc260b0bbdf7138f75de11\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805\",\n                            \"lessThan\": \"da4fbc1488a4cec6748da685181ee4449a878dac\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805\",\n                            \"lessThan\": \"f41c538881eec4dcf5961a242097d447f848cda6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2b7a961cea0e5b65afda911f76d14fec5c98d024\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.1.140\",\n                            \"lessThan\": \"6.1.160\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.92\",\n                            \"lessThan\": \"6.6.107\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.30\",\n                            \"lessThan\": \"6.12.48\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.14.8\",\n                            \"lessThan\": \"6.15\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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/dma/idxd/init.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.160\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.107\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.48\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.16.8\",\n                            \"lessThanOrEqual\": \"6.16.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.17\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/24414bbcb37e1af95190af36c21ae51d497e1a9e","https://git.kernel.org/stable/c/0e95ee7f532b21206fe3f1c4054002b0d21e3b9c","https://git.kernel.org/stable/c/dd7a7e43269711d757fc260b0bbdf7138f75de11","https://git.kernel.org/stable/c/da4fbc1488a4cec6748da685181ee4449a878dac","https://git.kernel.org/stable/c/f41c538881eec4dcf5961a242097d447f848cda6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39871","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-39871","identifiers":["CVE-2025-39871"]},"retained":false,"historicalAffected":[]}],"coverage":[]}