{"id":"CVE-2026-99036","state":"PUBLISHED","title":"dm: fix reading free memory in do_resume","description":"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.","publishedAt":"2026-10-23T12:21:49.410Z","updatedAt":"2026-10-30T12:41:09.415Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"2bc5df0cf906f36a8f59ac864139ee2b7b53d3c0","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"48169328021dfd59121f9a66cca919b7defcd3fa","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"7a272c2338f758e3b6e664ebf7488ac40f48a2a4","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"281f68d6cf8acb2547ebf0a849b8beae8fb0ec3c","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"2c96d1a8324e7736e0f8a5790ecf39d36c2c4a82","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"e3bf232c913b7e0103d323f15e6342d37cb1b357","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"301691c32b8ad023e3316d5dbb6a8cf52d47b0dc","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"c9417c1c5269e2bd0570fbe53e4ec03a8d31f008","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-ioctl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.29","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.29","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-ioctl.c"]}],"references":["https://git.kernel.org/stable/c/2bc5df0cf906f36a8f59ac864139ee2b7b53d3c0","https://git.kernel.org/stable/c/48169328021dfd59121f9a66cca919b7defcd3fa","https://git.kernel.org/stable/c/7a272c2338f758e3b6e664ebf7488ac40f48a2a4","https://git.kernel.org/stable/c/281f68d6cf8acb2547ebf0a849b8beae8fb0ec3c","https://git.kernel.org/stable/c/2c96d1a8324e7736e0f8a5790ecf39d36c2c4a82","https://git.kernel.org/stable/c/e3bf232c913b7e0103d323f15e6342d37cb1b357","https://git.kernel.org/stable/c/301691c32b8ad023e3316d5dbb6a8cf52d47b0dc","https://git.kernel.org/stable/c/c9417c1c5269e2bd0570fbe53e4ec03a8d31f008"],"weaknesses":[],"ingestedAt":"2026-10-30T13:00:06.648Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99036.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99036","state":"PUBLISHED","datePublished":"2026-10-23T12:21:49.410Z","dateUpdated":"2026-10-30T12:41:09.415Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.387Z"},"containers":{"cna":{"title":"dm: fix reading free memory in do_resume","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"2bc5df0cf906f36a8f59ac864139ee2b7b53d3c0","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"48169328021dfd59121f9a66cca919b7defcd3fa","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"7a272c2338f758e3b6e664ebf7488ac40f48a2a4","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"281f68d6cf8acb2547ebf0a849b8beae8fb0ec3c","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"2c96d1a8324e7736e0f8a5790ecf39d36c2c4a82","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"e3bf232c913b7e0103d323f15e6342d37cb1b357","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"301691c32b8ad023e3316d5dbb6a8cf52d47b0dc","versionType":"git"},{"version":"d58168763f74d1edbc296d7038c60efe6493fdd4","status":"affected","lessThan":"c9417c1c5269e2bd0570fbe53e4ec03a8d31f008","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-ioctl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.29","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.29","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-ioctl.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/2bc5df0cf906f36a8f59ac864139ee2b7b53d3c0"},{"url":"https://git.kernel.org/stable/c/48169328021dfd59121f9a66cca919b7defcd3fa"},{"url":"https://git.kernel.org/stable/c/7a272c2338f758e3b6e664ebf7488ac40f48a2a4"},{"url":"https://git.kernel.org/stable/c/281f68d6cf8acb2547ebf0a849b8beae8fb0ec3c"},{"url":"https://git.kernel.org/stable/c/2c96d1a8324e7736e0f8a5790ecf39d36c2c4a82"},{"url":"https://git.kernel.org/stable/c/e3bf232c913b7e0103d323f15e6342d37cb1b357"},{"url":"https://git.kernel.org/stable/c/301691c32b8ad023e3316d5dbb6a8cf52d47b0dc"},{"url":"https://git.kernel.org/stable/c/c9417c1c5269e2bd0570fbe53e4ec03a8d31f008"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:41:09.415Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"7.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}