CVE-2026-68165 (GCVE-0-2026-68165)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-19 16:30
VLAI
Title
mm/damon/core: validate ranges in damon_set_regions()
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: validate ranges in damon_set_regions() DAMON core logic assumes zero length regions don't exist. However, a few DAMON API callers including DAMON_SYSFS, DAMON_RECLAIM and DAMON_LRU_SORT allow users to set empty monitoring target regions. This could result in WARN_ONCE() on CONFIG_DAMON_DEBUG_SANITY enabled kernel, and divide-by-zero from damon_merge_two_regions(). For example, the WANR_ONCE() can be triggered like below. # grep DAMON_DEBUG_SANITY /boot/config-$(uname -r) # CONFIG_DAMON_DEBUG_SANITY=y # damo start # cd /sys/kernel/mm/damon/admin/kdamonds/0 # echo 0 > contexts/0/targets/0/regions/0/start # echo 0 > contexts/0/targets/0/regions/0/end # echo commit > state # dmesg [....] [ 73.705780] ------------[ cut here ]------------ [ 73.707552] start 0 >= end 0 [ 73.708452] WARNING: mm/damon/core.c:359 at damon_new_region+0x6e/0x80, CPU#1: kdamond.0/758 [...] All DAMON API callers eventually use damon_set_regions() to setup the regions. Add the validation logic in the function.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 43b0536cb4710e7bb591edfda7e68a1c327a3409 , < 71cf8a3ee1c18cfa8b88cc14bac9c2f43dd29f9b (git)
Affected: 43b0536cb4710e7bb591edfda7e68a1c327a3409 , < b585facbafbb5cf117b37b1c75819ac046646c27 (git)
Affected: 43b0536cb4710e7bb591edfda7e68a1c327a3409 , < c927b73a5694c735314ea10e7c81c07f9bd51ad7 (git)
Affected: 43b0536cb4710e7bb591edfda7e68a1c327a3409 , < 4b6f1d6d5d07855bd1bb9e64922b049062138bfa (git)
Affected: 43b0536cb4710e7bb591edfda7e68a1c327a3409 , < 43aaddd0fa92010a68adeda7744c7cf497a1c8e9 (git)
Affected: 43b0536cb4710e7bb591edfda7e68a1c327a3409 , < 1292c0ecb1caefb8ca064a3639d5673991e8810c (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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\u0027t 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 \u003e contexts/0/targets/0/regions/0/start\n    # echo 0 \u003e contexts/0/targets/0/regions/0/end\n    # echo commit \u003e state\n    # dmesg\n    [....]\n    [   73.705780] ------------[ cut here ]------------\n    [   73.707552] start 0 \u003e= 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."
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          }
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        "lastModified": "2026-08-19T17:20:33.833",
        "metrics": {},
        "published": "2026-08-10T13:20:02.973",
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      "cve": "CVE-2026-68165",
      "id": "CVE-2026-68165",
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      "product_status:known_affected": "232",
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      "title": "kernel: mm/damon/core: validate ranges in damon_set_regions()",
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      "cve": "CVE-2026-68165",
      "id": "CVE-2026-68165",
      "initial_release_date": "2026-08-13T16:23:55Z",
      "product_status:known_affected": "123",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68165",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68165.json",
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  }
}



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