CVE-2025-38071

MEDIUM

MEDIUM Priority: 0.01 BB Relevance: 36/100

Published: 2025-06-18 Modified: 2026-11-05 First seen: 2026-11-05 Status: active

Attack Surface

Low Complexity No Interaction

CVSS Vector Breakdown

AV: Local

AC: Low

PR: Low

UI: None

S: Unchanged

C: None

I: None

A: High

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.

Affected Software (8)

Vendor	Product	Version
Linux	Linux	a7259df7670240ee03b0cfce8a3e5d3773911e24 < 8c18c904d301ffeb33b071eadc55cd6131e1e9be
Linux	Linux	a7259df7670240ee03b0cfce8a3e5d3773911e24 < bffd5f2815c5234d609725cd0dc2f4bc5de2fc67
Linux	Linux	a7259df7670240ee03b0cfce8a3e5d3773911e24 < c6f2694c580c27dca0cf7546ee9b4bfa6b940e38
Linux	Linux	a7259df7670240ee03b0cfce8a3e5d3773911e24 < dde4800d2b0f68b945fd81d4fc2d4a10ae25f743
Linux	Linux	a7259df7670240ee03b0cfce8a3e5d3773911e24 < 631ca8909fd5c62b9fda9edda93924311a78a9c4
Linux	Linux	5.15
debian	debian_linux	11.0
linux	linux_kernel	< 6.1.141