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CVE-2026-64297

Estado: AnalizadaMedia (5.5)—

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.

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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.]

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
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          "attackComplexity": "LOW",
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      "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->pages remains NULL and\ninfo->max_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->used_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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