{"id":"CVE-2026-99036","summary":"dm: fix reading free memory in do_resume","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix reading free memory in do_resume\n\nWhen do_resume calls dm_table_get_mode(new_map), the call is done without\nholding any locks (it only holds a reference to the md). It may be\npossible that another concurrent ioctl on the same device will swap table\nafter dm_swap_table and before dm_table_get_mode. In this case,\ndm_table_get_mode(new_map) reads freed memory.\n\nThis race condition was triggered by syzbot.\n\nThis commit fixes the race by reading mode of the new table before\ndm_swap_table. Note that new_map is also passed to dm_ima_need_measure,\nbut this function doesn't attempt to dereference it, so this call should\nbe safe.\n\nNote that this is not a security bug because only root can trigger it and\nthe commonly used tools such as lvm or cryptsetup do not call the ioctls\nconcurrently, so that they can't trigger it acceidentally.","modified":"2026-11-01T02:30:15.632291188Z","published":"2026-10-23T12:21:49.410Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99036.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/281f68d6cf8acb2547ebf0a849b8beae8fb0ec3c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2bc5df0cf906f36a8f59ac864139ee2b7b53d3c0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2c96d1a8324e7736e0f8a5790ecf39d36c2c4a82"},{"type":"WEB","url":"https://git.kernel.org/stable/c/301691c32b8ad023e3316d5dbb6a8cf52d47b0dc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/48169328021dfd59121f9a66cca919b7defcd3fa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7a272c2338f758e3b6e664ebf7488ac40f48a2a4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c9417c1c5269e2bd0570fbe53e4ec03a8d31f008"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e3bf232c913b7e0103d323f15e6342d37cb1b357"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99036.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99036"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d58168763f74d1edbc296d7038c60efe6493fdd4"},{"fixed":"2bc5df0cf906f36a8f59ac864139ee2b7b53d3c0"},{"fixed":"48169328021dfd59121f9a66cca919b7defcd3fa"},{"fixed":"7a272c2338f758e3b6e664ebf7488ac40f48a2a4"},{"fixed":"281f68d6cf8acb2547ebf0a849b8beae8fb0ec3c"},{"fixed":"2c96d1a8324e7736e0f8a5790ecf39d36c2c4a82"},{"fixed":"e3bf232c913b7e0103d323f15e6342d37cb1b357"},{"fixed":"301691c32b8ad023e3316d5dbb6a8cf52d47b0dc"},{"fixed":"c9417c1c5269e2bd0570fbe53e4ec03a8d31f008"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99036.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.29"},{"fixed":"5.10.273"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.160"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.57"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99036.json"}}],"schema_version":"1.9.2"}