{"id":"CVE-2026-68165","state":"PUBLISHED","title":"mm/damon/core: validate ranges in damon_set_regions()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: validate ranges in damon_set_regions()\n\nDAMON core logic assumes zero length regions don't exist.  However, a few\nDAMON API callers including DAMON_SYSFS, DAMON_RECLAIM and DAMON_LRU_SORT\nallow users to set empty monitoring target regions.  This could result in\nWARN_ONCE() on CONFIG_DAMON_DEBUG_SANITY enabled kernel, and\ndivide-by-zero from damon_merge_two_regions().\n\nFor example, the WANR_ONCE() can be triggered like below.\n\n    # grep DAMON_DEBUG_SANITY /boot/config-$(uname -r)\n    # CONFIG_DAMON_DEBUG_SANITY=y\n    # damo start\n    # cd /sys/kernel/mm/damon/admin/kdamonds/0\n    # echo 0 > contexts/0/targets/0/regions/0/start\n    # echo 0 > contexts/0/targets/0/regions/0/end\n    # echo commit > state\n    # dmesg\n    [....]\n    [   73.705780] ------------[ cut here ]------------\n    [   73.707552] start 0 >= end 0\n    [   73.708452] WARNING: mm/damon/core.c:359 at damon_new_region+0x6e/0x80, CPU#1: kdamond.0/758\n    [...]\n\nAll DAMON API callers eventually use damon_set_regions() to setup the\nregions.  Add the validation logic in the function.","publishedAt":"2026-08-10T11:59:33.152Z","updatedAt":"2026-08-19T16:30:37.581Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"43b0536cb4710e7bb591edfda7e68a1c327a3409","status":"affected","lessThan":"71cf8a3ee1c18cfa8b88cc14bac9c2f43dd29f9b","versionType":"git"},{"version":"43b0536cb4710e7bb591edfda7e68a1c327a3409","status":"affected","lessThan":"b585facbafbb5cf117b37b1c75819ac046646c27","versionType":"git"},{"version":"43b0536cb4710e7bb591edfda7e68a1c327a3409","status":"affected","lessThan":"c927b73a5694c735314ea10e7c81c07f9bd51ad7","versionType":"git"},{"version":"43b0536cb4710e7bb591edfda7e68a1c327a3409","status":"affected","lessThan":"4b6f1d6d5d07855bd1bb9e64922b049062138bfa","versionType":"git"},{"version":"43b0536cb4710e7bb591edfda7e68a1c327a3409","status":"affected","lessThan":"43aaddd0fa92010a68adeda7744c7cf497a1c8e9","versionType":"git"},{"version":"43b0536cb4710e7bb591edfda7e68a1c327a3409","status":"affected","lessThan":"1292c0ecb1caefb8ca064a3639d5673991e8810c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/damon/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.16","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/damon/core.c"]}],"references":["https://git.kernel.org/stable/c/71cf8a3ee1c18cfa8b88cc14bac9c2f43dd29f9b","https://git.kernel.org/stable/c/b585facbafbb5cf117b37b1c75819ac046646c27","https://git.kernel.org/stable/c/c927b73a5694c735314ea10e7c81c07f9bd51ad7","https://git.kernel.org/stable/c/4b6f1d6d5d07855bd1bb9e64922b049062138bfa","https://git.kernel.org/stable/c/43aaddd0fa92010a68adeda7744c7cf497a1c8e9","https://git.kernel.org/stable/c/1292c0ecb1caefb8ca064a3639d5673991e8810c"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68165.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68165","state":"PUBLISHED","datePublished":"2026-08-10T11:59:33.152Z","dateUpdated":"2026-08-19T16:30:37.581Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.372Z"},"containers":{"cna":{"title":"mm/damon/core: validate ranges in damon_set_regions()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: validate ranges in damon_set_regions()\n\nDAMON core logic assumes zero length regions don't exist.  However, a few\nDAMON API callers including DAMON_SYSFS, DAMON_RECLAIM and DAMON_LRU_SORT\nallow users to set empty monitoring target regions.  This could result in\nWARN_ONCE() on CONFIG_DAMON_DEBUG_SANITY enabled kernel, and\ndivide-by-zero from damon_merge_two_regions().\n\nFor example, the WANR_ONCE() can be triggered like below.\n\n    # grep DAMON_DEBUG_SANITY /boot/config-$(uname -r)\n    # CONFIG_DAMON_DEBUG_SANITY=y\n    # damo start\n    # cd /sys/kernel/mm/damon/admin/kdamonds/0\n    # echo 0 > contexts/0/targets/0/regions/0/start\n    # echo 0 > contexts/0/targets/0/regions/0/end\n    # echo commit > state\n    # dmesg\n    [....]\n    [   73.705780] ------------[ cut here ]------------\n    [   73.707552] start 0 >= end 0\n    [   73.708452] WARNING: mm/damon/core.c:359 at damon_new_region+0x6e/0x80, CPU#1: kdamond.0/758\n    [...]\n\nAll DAMON API callers eventually use damon_set_regions() to setup the\nregions.  Add the validation logic in the function."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"43b0536cb4710e7bb591edfda7e68a1c327a3409","status":"affected","lessThan":"71cf8a3ee1c18cfa8b88cc14bac9c2f43dd29f9b","versionType":"git"},{"version":"43b0536cb4710e7bb591edfda7e68a1c327a3409","status":"affected","lessThan":"b585facbafbb5cf117b37b1c75819ac046646c27","versionType":"git"},{"version":"43b0536cb4710e7bb591edfda7e68a1c327a3409","status":"affected","lessThan":"c927b73a5694c735314ea10e7c81c07f9bd51ad7","versionType":"git"},{"version":"43b0536cb4710e7bb591edfda7e68a1c327a3409","status":"affected","lessThan":"4b6f1d6d5d07855bd1bb9e64922b049062138bfa","versionType":"git"},{"version":"43b0536cb4710e7bb591edfda7e68a1c327a3409","status":"affected","lessThan":"43aaddd0fa92010a68adeda7744c7cf497a1c8e9","versionType":"git"},{"version":"43b0536cb4710e7bb591edfda7e68a1c327a3409","status":"affected","lessThan":"1292c0ecb1caefb8ca064a3639d5673991e8810c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/damon/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.16","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/damon/core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/71cf8a3ee1c18cfa8b88cc14bac9c2f43dd29f9b"},{"url":"https://git.kernel.org/stable/c/b585facbafbb5cf117b37b1c75819ac046646c27"},{"url":"https://git.kernel.org/stable/c/c927b73a5694c735314ea10e7c81c07f9bd51ad7"},{"url":"https://git.kernel.org/stable/c/4b6f1d6d5d07855bd1bb9e64922b049062138bfa"},{"url":"https://git.kernel.org/stable/c/43aaddd0fa92010a68adeda7744c7cf497a1c8e9"},{"url":"https://git.kernel.org/stable/c/1292c0ecb1caefb8ca064a3639d5673991e8810c"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:30:37.581Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}