CVE-2026-64297 (GCVE-0-2026-64297)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-08-17 04:52
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: module: decompress: check return value of module_extend_max_pages() module_extend_max_pages() calls kvrealloc() internally and returns -ENOMEM on allocation failure. The return value is never checked. If the initial allocation fails, info->pages remains NULL and info->max_pages remains 0. Subsequent calls to module_get_next_page() will attempt to dynamically grow the array by calling module_extend_max_pages(info, 0) since info->used_pages is 0. This results in kvrealloc(NULL, 0) returning ZERO_SIZE_PTR, which is treated as a success, leading to a dereference of ZERO_SIZE_PTR and a kernel oops. Fix: add the missing error check after module_extend_max_pages() and return immediately on failure. This matches the pattern used by every other kvrealloc() caller in the module loading path. [Sami: Corrected the analysis in the commit message.]
References
Impacted products
Vendor Product Version
Linux Linux Version: b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7
Version: b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7
Version: b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7
Version: b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7
Version: b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7
Version: b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmodule: decompress: check return value of module_extend_max_pages()\n\nmodule_extend_max_pages() calls kvrealloc() internally and returns\n-ENOMEM on allocation failure. The return value is never checked.\n\nIf the initial allocation fails, info-\u003epages remains NULL and\ninfo-\u003emax_pages remains 0. Subsequent calls to module_get_next_page()\nwill attempt to dynamically grow the array by calling\nmodule_extend_max_pages(info, 0) since info-\u003eused_pages is 0. This\nresults in kvrealloc(NULL, 0) returning ZERO_SIZE_PTR, which is treated\nas a success, leading to a dereference of ZERO_SIZE_PTR and a kernel\noops.\n\nFix: add the missing error check after module_extend_max_pages() and\nreturn immediately on failure. This matches the pattern used by every\nother kvrealloc() caller in the module loading path.\n\n[Sami: Corrected the analysis in the commit message.]"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:52:54.883Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/e7f174715f9f0cbcb9e87b52e4fc4ef149baac98"
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          "url": "https://git.kernel.org/stable/c/afcc0515bbdd28d509a2b5870faaa89b137f5d53"
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          "url": "https://git.kernel.org/stable/c/e7da02659c229f73492fb1ed87ceda4090153aaa"
        },
        {
          "url": "https://git.kernel.org/stable/c/786d2d84416a9a1c1a47b71a68d679d886284be2"
        }
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      "title": "module: decompress: check return value of module_extend_max_pages()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64297",
    "datePublished": "2026-07-25T08:49:34.486Z",
    "dateReserved": "2026-07-19T15:36:31.778Z",
    "dateUpdated": "2026-08-17T04:52:54.883Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}


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