{"id":"CVE-2026-93096","revision":"92fb7adb252a491f9d07986bc7bf72a7","records":[{"revision":"92fb7adb252a491f9d07986bc7bf72a7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93096","aliases":[],"title":"cxl/features: Serialize multi-part Get/Set Feature transfers","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/features: Serialize multi-part Get/Set Feature transfers\n\nA Get or Set Feature payload larger than the mailbox payload size is\nsplit into several mailbox commands. mbox_mutex only serializes\nindividual mailbox commands and is dropped between iterations of these\nloops. Nothing serializes the multi-part transfer as a whole.\ncxl_get_feature() and cxl_set_feature() are reachable concurrently\nfrom fwctl (per-fd RPCs run under a read-held registration lock) and\nfrom the EDAC scrub/ECS/repair paths, so two transfers to the same\nmailbox can interleave their parts and corrupt the device's transfer\ncontext.\n\nAdd a per-mailbox feat_mutex and hold it across the whole transfer in\nboth functions. It nests outside mbox_mutex (which is taken inside\ncxl_internal_send_cmd()), and is taken nowhere else, so no lock-ordering\ninversion is introduced.","state":0,"publishedAt":"2026-09-17T16:11:10.359+00:00","modifiedAt":"2026-10-19T09:05:29.455+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/cxl/core/features.c\",\n                        \"drivers/cxl/core/mbox.c\",\n                        \"include/cxl/mailbox.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5e5ac21f629de796ab5d598b59c5e468c6fe4f95\",\n                            \"lessThan\": \"c6492e17412048387435f256ffafc4dd6518db28\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e5ac21f629de796ab5d598b59c5e468c6fe4f95\",\n                            \"lessThan\": \"7682b617db1f19bc606b5f1badadcf1e63a87b14\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e5ac21f629de796ab5d598b59c5e468c6fe4f95\",\n                            \"lessThan\": \"77b814c1832fde018c30357b4ec3fcdaa91a1c10\",\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/cxl/core/features.c\",\n                        \"drivers/cxl/core/mbox.c\",\n                        \"include/cxl/mailbox.h\"\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\": \"6.18.57\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\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/c6492e17412048387435f256ffafc4dd6518db28","https://git.kernel.org/stable/c/7682b617db1f19bc606b5f1badadcf1e63a87b14","https://git.kernel.org/stable/c/77b814c1832fde018c30357b4ec3fcdaa91a1c10"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93096","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93096","identifiers":["CVE-2026-93096"]},"retained":false,"historicalAffected":[]}],"coverage":[]}