CVE-2026-46042 (GCVE-0-2026-46042)
Vulnerability from cvelistv5
Published
2026-05-27 12:56
Modified
2026-06-14 17:50
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix memory leaks in weighted_interleave_auto_store() weighted_interleave_auto_store() fetches old_wi_state inside the if (!input) block only. This causes two memory leaks: 1. When a user writes "false" and the current mode is already manual, the function returns early without freeing the freshly allocated new_wi_state. 2. When a user writes "true", old_wi_state stays NULL because the fetch is skipped entirely. The old state is then overwritten by rcu_assign_pointer() but never freed, since the cleanup path is gated on old_wi_state being non-NULL. A user can trigger this repeatedly by writing "1" in a loop. Fix both leaks by moving the old_wi_state fetch before the input check, making it unconditional. This also allows a unified early return for both "true" and "false" when the requested mode matches the current mode. Reviewed by: Donet Tom <donettom@linux.ibm.com>
References
Impacted products
Vendor Product Version
Linux Linux Version: e341f9c3c8412e57fe0042a33a2640245ecdf619
Version: e341f9c3c8412e57fe0042a33a2640245ecdf619
Version: e341f9c3c8412e57fe0042a33a2640245ecdf619
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/mempolicy.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "versions": [
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          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.27",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mempolicy: fix memory leaks in weighted_interleave_auto_store()\n\nweighted_interleave_auto_store() fetches old_wi_state inside the if\n(!input) block only.  This causes two memory leaks:\n\n1. When a user writes \"false\" and the current mode is already manual,\n   the function returns early without freeing the freshly allocated\n   new_wi_state.\n\n2. When a user writes \"true\", old_wi_state stays NULL because the\n   fetch is skipped entirely. The old state is then overwritten by\n   rcu_assign_pointer() but never freed, since the cleanup path is\n   gated on old_wi_state being non-NULL. A user can trigger this\n   repeatedly by writing \"1\" in a loop.\n\nFix both leaks by moving the old_wi_state fetch before the input check,\nmaking it unconditional.  This also allows a unified early return for both\n\"true\" and \"false\" when the requested mode matches the current mode.\n\nReviewed by: Donet Tom \u003cdonettom@linux.ibm.com\u003e"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:50:08.044Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/c42a7efb9060d89b72708ffaf255d0002c2164a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/39caa9ca863f96b3d00447c5aa200cabda489856"
        },
        {
          "url": "https://git.kernel.org/stable/c/6fae274ce0e3109cbbc4c18b354eaace1f0af7d7"
        }
      ],
      "title": "mm/mempolicy: fix memory leaks in weighted_interleave_auto_store()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46042",
    "datePublished": "2026-05-27T12:56:56.830Z",
    "dateReserved": "2026-05-13T15:03:33.094Z",
    "dateUpdated": "2026-06-14T17:50:08.044Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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