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CVE-2026-64297

module: decompress: check return value of module_extend_max_pages() PUBLISHED

Description (CNA)

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.]

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 before e7f174715f9f0cbcb9e87b52e4fc4ef149baac98; affected b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 before afcc0515bbdd28d509a2b5870faaa89b137f5d53; affected b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 before 168072baf9ad516d5a06046514c7fea4c0671990; affected b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 before a82e170637e050a803b4f37542371ef216bf66d2; affected b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 before e7da02659c229f73492fb1ed87ceda4090153aaa; affected b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 before 786d2d84416a9a1c1a47b71a68d679d886284be2
Linux / Linuxaffected 5.17; unaffected 0 before 5.17; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.96 through 6.12.*; unaffected 6.18.39 through 6.18.*; unaffected 7.1.4 through 7.1.*; unaffected 7.2 through *

CWE

No CWE identifiers supplied.

References