Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 6.1.141 |
| Debian | Debian Linux | 11.0 |
References
- https://git.kernel.org/stable/c/631ca8909fd5c62b9fda9edda93924311a78a9c4Patch
- https://git.kernel.org/stable/c/8c18c904d301ffeb33b071eadc55cd6131e1e9bePatch
- https://git.kernel.org/stable/c/bffd5f2815c5234d609725cd0dc2f4bc5de2fc67Patch
- https://git.kernel.org/stable/c/c6f2694c580c27dca0cf7546ee9b4bfa6b940e38Patch
- https://git.kernel.org/stable/c/dde4800d2b0f68b945fd81d4fc2d4a10ae25f743Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
FAQ
What is CVE-2025-38071?
CVE-2025-38071 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 c...
How severe is CVE-2025-38071?
CVE-2025-38071 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-38071?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.