CVE-2026-68164 (GCVE-0-2026-68164)
Vulnerability from cvelistv5
Published
2026-08-10 11:59
Modified
2026-08-19 16:30
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: disallow overlapping input ranges for damon_set_regions() damon_set_regions() assumes the input ranges are sorted by the address and don't overlap each other. Hence the assumption was initially to be explicitly validated. But commit 97d482f4592f ("mm/damon/sysfs: reuse damon_set_regions() for regions setting") has mistakenly removed the validation. This can make DAMON behave in unexpected ways. At the best, the monitoring results snapshot will just look weird since there will be overlapping regions. DAMOS will also work weirdly, applying the same action multiple times for overlapping regions, and make DAMOS quota weird. More seriously, depending on the setup and regions updates sequence, negative size regions can be made. It will trigger WARN_ONCE() if the kernel is built with CONFIG_DAMON_DEBUG_SANITY=y. Depending on the monitoring results, the negative size region can further trigger division by zero in damon_merge_two_regions(). Note that some of the consequences including the WARN_ONCE() and the divide by zero depend on commits that were introduced after the root cause commit 97d482f4592f ("mm/damon/sysfs: reuse damon_set_regions() for regions setting"). Fix the problems by checking the assumption and returning an error if the input ranges don't meet the assumption. The issue was discovered [1] by Sashiko.
References
Impacted products
Vendor Product Version
Linux Linux Version: 97d482f4592fde2322c319f07bc54f3a0d37861c
Version: 97d482f4592fde2322c319f07bc54f3a0d37861c
Version: 97d482f4592fde2322c319f07bc54f3a0d37861c
Version: 97d482f4592fde2322c319f07bc54f3a0d37861c
Version: 97d482f4592fde2322c319f07bc54f3a0d37861c
Version: 97d482f4592fde2322c319f07bc54f3a0d37861c
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: disallow overlapping input ranges for damon_set_regions()\n\ndamon_set_regions() assumes the input ranges are sorted by the address and\ndon\u0027t overlap each other.  Hence the assumption was initially to be\nexplicitly validated.  But commit 97d482f4592f (\"mm/damon/sysfs: reuse\ndamon_set_regions() for regions setting\") has mistakenly removed the\nvalidation.\n\nThis can make DAMON behave in unexpected ways.  At the best, the\nmonitoring results snapshot will just look weird since there will be\noverlapping regions.  DAMOS will also work weirdly, applying the same\naction multiple times for overlapping regions, and make DAMOS quota weird.\nMore seriously, depending on the setup and regions updates sequence,\nnegative size regions can be made.  It will trigger WARN_ONCE() if the\nkernel is built with CONFIG_DAMON_DEBUG_SANITY=y.  Depending on the\nmonitoring results, the negative size region can further trigger division\nby zero in damon_merge_two_regions().\n\nNote that some of the consequences including the WARN_ONCE() and the\ndivide by zero depend on commits that were introduced after the root cause\ncommit 97d482f4592f (\"mm/damon/sysfs: reuse damon_set_regions() for\nregions setting\").\n\nFix the problems by checking the assumption and returning an error if\nthe input ranges don\u0027t meet the assumption.\n\nThe issue was discovered [1] by Sashiko."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:30:34.916Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/a5c453fffb6f2ce75fc10b5d8bc475f1758010bd"
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          "url": "https://git.kernel.org/stable/c/4b4a3e7ef7bb622237495db9ba4dfd7417d6530e"
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          "url": "https://git.kernel.org/stable/c/954157679ec34661c2e87e7eb796104a797c32db"
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      "title": "mm/damon/core: disallow overlapping input ranges for damon_set_regions()",
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    "cveId": "CVE-2026-68164",
    "datePublished": "2026-08-10T11:59:31.670Z",
    "dateReserved": "2026-07-30T09:28:09.372Z",
    "dateUpdated": "2026-08-19T16:30:34.916Z",
    "state": "PUBLISHED"
  },
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}


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