{"id":"CVE-2026-90270","revision":"14f5c93b46ef4c1ab7334ff25aea60e5","records":[{"revision":"14f5c93b46ef4c1ab7334ff25aea60e5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90270","aliases":[],"title":"arm_mpam: Disable driver unbind to avoid UAF","description":"In the Linux kernel, the following vulnerability has been resolved:\n\narm_mpam: Disable driver unbind to avoid UAF\n\nWhen a user unbinds an MSC and that MSC is the only MSC left for a\ncomponent then the corresponding mpam_component will be freed. If the user\nthen goes on to read the schemata file in the resctrl filesystem then the\nmpam_component will be accessed from resctrl_arch_get_config() leading to a\nuse after free.\n\nAs the MPAM driver is not a module the unbind sysfs interface is the only\nway to trigger the remove. Instead of dealing with the complexity of\nallowing some unused MSC to unbind just remove the unbind sysfs interface.","state":0,"publishedAt":"2026-09-17T16:08:04.648+00:00","modifiedAt":"2026-10-19T09:00:47.928+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/resctrl/mpam_devices.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"f04046f2577a5c76167333ca99d3903ee5331ba0\",\n                            \"lessThan\": \"7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f04046f2577a5c76167333ca99d3903ee5331ba0\",\n                            \"lessThan\": \"bb1a0f582d519c0461b0940116e2b52c5ba31459\",\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/resctrl/mpam_devices.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.19\",\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/7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2","https://git.kernel.org/stable/c/bb1a0f582d519c0461b0940116e2b52c5ba31459"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90270","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90270","identifiers":["CVE-2026-90270"]},"retained":false,"historicalAffected":[]}],"coverage":[]}