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.
CVE-2025-38071
CVSS base score
5.5 (v3.1)
Severity
MEDIUM
Attack vector
Local
Last modified
November 5, 2026
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products
linux linux kernel
debian debian linux
References
- git.kernel.org Patch
- git.kernel.org Patch
- git.kernel.org Patch
- git.kernel.org Patch
- git.kernel.org Patch
- lists.debian.org Third Party Advisory
- cert-portal.siemens.com