CVE-2025-38071 Information

Jun 19, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

x86/mm: Check return value from memblock_phys_alloc_range()

At least with CONFIG_PHYSICAL_START=0x100000 if there is < 4 MiB of contiguous free memory available at this point the kernel will crash and burn because memblock_phys_alloc_range() returns 0 on failure which leads memblock_phys_free() to throw the first 4 MiB of physical memory to the wolves.

At a minimum it should fail gracefully with a meaningful diagnostic but in fact everything seems to work fine without the weird reserve allocation.

Reference

https://git.kernel.org/stable/c/631ca8909fd5c62b9fda9edda93924311a78a9c4 https://git.kernel.org/stable/c/8c18c904d301ffeb33b071eadc55cd6131e1e9be https://git.kernel.org/stable/c/bffd5f2815c5234d609725cd0dc2f4bc5de2fc67 https://git.kernel.org/stable/c/c6f2694c580c27dca0cf7546ee9b4bfa6b940e38 https://git.kernel.org/stable/c/dde4800d2b0f68b945fd81d4fc2d4a10ae25f743

CNNVD-202506-2201 (Published: 2025-06-18)

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