{"id":"CVE-2026-98342","revision":"b76a01cb7f0c463d957e0f83ddd6fbb3","records":[{"revision":"b76a01cb7f0c463d957e0f83ddd6fbb3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98342","aliases":[],"title":"dmaengine: wait for RCU readers before releasing dma_device","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: wait for RCU readers before releasing dma_device\n\ndma_issue_pending_all() walks the dma_device_list with\nlist_for_each_entry_rcu() under rcu_read_lock(). dma_device_release()\nunlinks the device with list_del_rcu() and then calls\ndevice->device_release() (which in many drivers, such as plx_dma.c,\ndirectly calls kfree()).\n\nBecause there is no grace period between unlinking the device and\nfreeing it, concurrent RCU readers in dma_issue_pending_all() can\naccess the device after it has been freed.\n\nThe lockless walk originally relied on clients holding a dmaengine\nreference to pin the provider module, and therefore the device, for as\nlong as they might traverse the list. Commit 8ad342a86359 (\"dmaengine:\nAdd reference counting to dma_device struct\") decoupled the dma_device\nlifetime from the module reference, so the device can now be released\nwhile a reader is still walking the list.\n\nAdd synchronize_rcu() before the device is freed, so RCU readers are\nguaranteed to have finished. Keep it unconditional: providers that do\nnot implement device_release() free the device themselves once\ndma_async_device_unregister() returns. This call will delay for a grace\nperiod with dma_list_mutex held, which is safe and only teardown path is\ndelayed.","state":0,"publishedAt":"2026-10-06T08:46:32.366+00:00","modifiedAt":"2026-10-19T09:17:53.321+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/dmaengine.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2ba05622b8b143b0c95968ba59bddfbd6d2f2559\",\n                            \"lessThan\": \"ac8ce9f89638d6d79875cca7d8ae42566a9bde15\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2ba05622b8b143b0c95968ba59bddfbd6d2f2559\",\n                            \"lessThan\": \"14578c78405d51fa92e4ada4502a45f537c0fcb8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2ba05622b8b143b0c95968ba59bddfbd6d2f2559\",\n                            \"lessThan\": \"cbb3310a5167e868a5e763e32b9a23b4d50669ee\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2ba05622b8b143b0c95968ba59bddfbd6d2f2559\",\n                            \"lessThan\": \"8577a5ec4f7e00443015ef99f646def093121a1b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2ba05622b8b143b0c95968ba59bddfbd6d2f2559\",\n                            \"lessThan\": \"4448a539a0c39141cccc67be6cacde0f35024313\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2ba05622b8b143b0c95968ba59bddfbd6d2f2559\",\n                            \"lessThan\": \"fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2ba05622b8b143b0c95968ba59bddfbd6d2f2559\",\n                            \"lessThan\": \"4aed7e47a10b94ea3c5171e8d1382081accd2e03\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2ba05622b8b143b0c95968ba59bddfbd6d2f2559\",\n                            \"lessThan\": \"dc750422170a563c7a81f6e49d36bb02c62ae37f\",\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/dma/dmaengine.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.29\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.29\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.54\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.8\",\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":[],"references":["https://git.kernel.org/stable/c/ac8ce9f89638d6d79875cca7d8ae42566a9bde15","https://git.kernel.org/stable/c/14578c78405d51fa92e4ada4502a45f537c0fcb8","https://git.kernel.org/stable/c/cbb3310a5167e868a5e763e32b9a23b4d50669ee","https://git.kernel.org/stable/c/8577a5ec4f7e00443015ef99f646def093121a1b","https://git.kernel.org/stable/c/4448a539a0c39141cccc67be6cacde0f35024313","https://git.kernel.org/stable/c/fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77","https://git.kernel.org/stable/c/4aed7e47a10b94ea3c5171e8d1382081accd2e03","https://git.kernel.org/stable/c/dc750422170a563c7a81f6e49d36bb02c62ae37f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98342","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98342","identifiers":["CVE-2026-98342"]},"retained":false,"historicalAffected":[]}],"coverage":[]}