CVE-2026-99240 (GCVE-0-2026-99240)

Vulnerability from cvelistv5 – Published: 2026-11-02 16:06 – Updated: 2026-11-03 19:13
VLAI
Title
mm/damon/core: error damos_commit_quota_goal() for zero target_value
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: error damos_commit_quota_goal() for zero target_value Patch series "mm/damon: move zero damos quota target_value handling to the core layer". Having zero DAMOS quota target value can cause division by zero. DAMON API callers are checking the target value parameters to avoid that. It is easy to make mistakes in some of the multiple API callers. Move that to the core layer. Patch 1 adds the corner case handling into the core layer DAMON parameters validation logic. Patches 2 and 3 remove no more needed DAMON API callers side handling of the corner case in DAMON_LRU_SORT and DMON_SAMPLIE_MTIER, respectively. This patch (of 3): If a DAMOS scheme has a damos_quota_goal of zero target_value, damos_quota_goal() could trigger division-by-zero error. Hence each DAMON API callers should do the zero target_value validation. It is easy to make mistakes. Actually such bugs in DAMON_LRU_SORT and DAMON_SAMPLE_MTIER were found and fixed [1]. It is better to handle the corner case only once in the core layer, instead of multiple places in all DAMON API callers. One straightforward option is using an alternative denominator for the corner case in the damos_quota_goal(). However, the zero target_value is meaningless. In this case, the quota goal is always evaluated as achieved or over-achieved. The quota will only keep being reduced. Simply avoid using zero target_value by adding a check in the core layer DAMOS quota goal parameters validation/commit path, damos_commit_quota_goal(). Update it to return an error in the case. Also update its caller to propagate the error.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c5e67d40a10234541e220750297304df79aaedd0 , < d5482be6243b816730689099c017109eb8730dd5 (git)
Affected: c5e67d40a10234541e220750297304df79aaedd0 , < cc190c4073f570fd78a9d00dd3d13a71eced5403 (git)
Affected: c5e67d40a10234541e220750297304df79aaedd0 , < 156aeda4d74e9007b56492ed1f3b5838822632be (git)
Affected: c5e67d40a10234541e220750297304df79aaedd0 , < 610c4438fb66e06d9e693c0ad3b2c1be54c0d61f (git)
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Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.18.60 , ≤ 6.18.* (semver)
Unaffected: 7.2.14 , ≤ 7.2.* (semver)
Unaffected: 7.3.1 , ≤ 7.3.* (semver)
Unaffected: 7.4-rc1 , ≤ * (original_commit_for_fix)
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    "dateReserved": "2026-09-25T10:25:14.403Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: error damos_commit_quota_goal() for zero target_value\n\nPatch series \"mm/damon: move zero damos quota target_value handling to the\ncore layer\".\n\nHaving zero DAMOS quota target value can cause division by zero.  DAMON\nAPI callers are checking the target value parameters to avoid that.  It is\neasy to make mistakes in some of the multiple API callers.  Move that to\nthe core layer.\n\nPatch 1 adds the corner case handling into the core layer DAMON parameters\nvalidation logic.  Patches 2 and 3 remove no more needed DAMON API callers\nside handling of the corner case in DAMON_LRU_SORT and DMON_SAMPLIE_MTIER,\nrespectively.\n\n\nThis patch (of 3):\n\nIf a DAMOS scheme has a damos_quota_goal of zero target_value,\ndamos_quota_goal() could trigger division-by-zero error.  Hence each DAMON\nAPI callers should do the zero target_value validation.  It is easy to\nmake mistakes.  Actually such bugs in DAMON_LRU_SORT and\nDAMON_SAMPLE_MTIER were found and fixed [1].\n\nIt is better to handle the corner case only once in the core layer,\ninstead of multiple places in all DAMON API callers.  One straightforward\noption is using an alternative denominator for the corner case in the\ndamos_quota_goal().  However, the zero target_value is meaningless.  In\nthis case, the quota goal is always evaluated as achieved or\nover-achieved.  The quota will only keep being reduced.\n\nSimply avoid using zero target_value by adding a check in the core layer\nDAMOS quota goal parameters validation/commit path,\ndamos_commit_quota_goal().  Update it to return an error in the case. \nAlso update its caller to propagate the error."
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        "id": "CVE-2026-99240",
        "lastModified": "2026-11-03T20:18:30.493",
        "metrics": {},
        "published": "2026-11-02T16:17:49.773",
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      "current_release_date": "2026-11-02T20:07:27+00:00",
      "cve": "CVE-2026-99240",
      "id": "CVE-2026-99240",
      "initial_release_date": "2026-11-02T16:06:43.703000+00:00",
      "product_status:known_affected": "238",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Denial of Service via division by zero in DAMON subsystem",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99240.json",
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}



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