{"id":"CVE-2026-68165","title":"mm/damon/core: validate ranges in damon_set_regions()","summary":"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…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 43b0536cb4710e7bb591edfda7e68a1c327a3409 < 71cf8a3ee1c18cfa8b88cc14bac9c2f43dd29f9b","Linux >= 43b0536cb4710e7bb591edfda7e68a1c327a3409 < b585facbafbb5cf117b37b1c75819ac046646c27","Linux >= 43b0536cb4710e7bb591edfda7e68a1c327a3409 < c927b73a5694c735314ea10e7c81c07f9bd51ad7","Linux >= 43b0536cb4710e7bb591edfda7e68a1c327a3409 < 4b6f1d6d5d07855bd1bb9e64922b049062138bfa","Linux >= 43b0536cb4710e7bb591edfda7e68a1c327a3409 < 43aaddd0fa92010a68adeda7744c7cf497a1c8e9","Linux >= 43b0536cb4710e7bb591edfda7e68a1c327a3409 < 1292c0ecb1caefb8ca064a3639d5673991e8810c","Linux 5.16"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:43:25.650452Z"},"published":"2026-08-10","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:44:59.951Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68165","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"}],"tags":["cve.org"],"epss":0.00211,"epssPercentile":0.11438,"ingestedAt":"2026-11-06T16:57:43.140Z","slug":"CVE-2026-68165","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 43b0536cb4710e7bb591edfda7e68a1c327a3409 < 71cf8a3ee1c18cfa8b88cc14bac9c2f43dd29f9b`\n- `Linux >= 43b0536cb4710e7bb591edfda7e68a1c327a3409 < b585facbafbb5cf117b37b1c75819ac046646c27`\n- `Linux >= 43b0536cb4710e7bb591edfda7e68a1c327a3409 < c927b73a5694c735314ea10e7c81c07f9bd51ad7`\n- `Linux >= 43b0536cb4710e7bb591edfda7e68a1c327a3409 < 4b6f1d6d5d07855bd1bb9e64922b049062138bfa`\n- `Linux >= 43b0536cb4710e7bb591edfda7e68a1c327a3409 < 43aaddd0fa92010a68adeda7744c7cf497a1c8e9`\n- `Linux >= 43b0536cb4710e7bb591edfda7e68a1c327a3409 < 1292c0ecb1caefb8ca064a3639d5673991e8810c`\n- `Linux 5.16`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}