CVE-2026-64297

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.]

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 < e7f174715f9f0cbcb9e87b52e4fc4ef149baac98affected
LinuxLinuxb1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 < afcc0515bbdd28d509a2b5870faaa89b137f5d53affected
LinuxLinuxb1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 < 168072baf9ad516d5a06046514c7fea4c0671990affected
LinuxLinuxb1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 < a82e170637e050a803b4f37542371ef216bf66d2affected
LinuxLinuxb1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 < e7da02659c229f73492fb1ed87ceda4090153aaaaffected
LinuxLinuxb1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 < 786d2d84416a9a1c1a47b71a68d679d886284be2affected
LinuxLinux5.17affected
LinuxLinux0 < 5.17unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.96 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References