{"id":"CVE-2026-43278","revision":"410a03adcfe2460ba02f7c84d1e02e2b","records":[{"revision":"410a03adcfe2460ba02f7c84d1e02e2b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-43278","aliases":[],"title":"dm: clear cloned request bio pointer when last clone bio completes","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm: clear cloned request bio pointer when last clone bio completes\n\nStale rq->bio values have been observed to cause double-initialization of\ncloned bios in request-based device-mapper targets, leading to\nuse-after-free and double-free scenarios.\n\nOne such case occurs when using dm-multipath on top of a PCIe NVMe\nnamespace, where cloned request bios are freed during\nblk_complete_request(), but rq->bio is left intact. Subsequent clone\nteardown then attempts to free the same bios again via\nblk_rq_unprep_clone().\n\nThe resulting double-free path looks like:\n\n  nvme_pci_complete_batch()\n    nvme_complete_batch()\n      blk_mq_end_request_batch()\n        blk_complete_request()        // called on a DM clone request\n          bio_endio()                 // first free of all clone bios\n          ...\n        rq->end_io()                  // end_clone_request()\n          dm_complete_request(tio->orig)\n            dm_softirq_done()\n              dm_done()\n                dm_end_request()\n                  blk_rq_unprep_clone()  // second free of clone bios\n\nFix this by clearing the clone request's bio pointer when the last cloned\nbio completes, ensuring that later teardown paths do not attempt to free\nalready-released bios.","state":0,"publishedAt":"2026-05-06T11:29:00.193+00:00","modifiedAt":"2026-10-19T19:16:25.598+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/md/dm-rq.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ab3e1d3bbab9e973aeb4dd4603251578658a47ff\",\n                            \"lessThan\": \"8d9ddad561136f7e6a9346767bf97b4d79e38e67\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ab3e1d3bbab9e973aeb4dd4603251578658a47ff\",\n                            \"lessThan\": \"7daf279c674d515fb22a727a7bbc92aeb35c5442\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ab3e1d3bbab9e973aeb4dd4603251578658a47ff\",\n                            \"lessThan\": \"e2e738e8dfbbf83bd2bae0467ec4420cc52da42a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ab3e1d3bbab9e973aeb4dd4603251578658a47ff\",\n                            \"lessThan\": \"b1c1a2637ebd675aa2d71fee8c70da8791d73850\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ab3e1d3bbab9e973aeb4dd4603251578658a47ff\",\n                            \"lessThan\": \"83d72091804600ead96dc9e9f518ea56cb4942f6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ab3e1d3bbab9e973aeb4dd4603251578658a47ff\",\n                            \"lessThan\": \"fb8a6c18fb9a6561f7a15b58b272442b77a242dd\",\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/md/dm-rq.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.1\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.165\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.128\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.75\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.16\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.6\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\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/8d9ddad561136f7e6a9346767bf97b4d79e38e67","https://git.kernel.org/stable/c/7daf279c674d515fb22a727a7bbc92aeb35c5442","https://git.kernel.org/stable/c/e2e738e8dfbbf83bd2bae0467ec4420cc52da42a","https://git.kernel.org/stable/c/b1c1a2637ebd675aa2d71fee8c70da8791d73850","https://git.kernel.org/stable/c/83d72091804600ead96dc9e9f518ea56cb4942f6","https://git.kernel.org/stable/c/fb8a6c18fb9a6561f7a15b58b272442b77a242dd"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43278","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-43278","identifiers":["CVE-2026-43278"]},"retained":false,"historicalAffected":[]}],"coverage":[]}