CVEvulnerability
CVE-2025-38071
5.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2025-06-18
- Last modified
- 2026-06-17
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 ([email protected])
- 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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 configurations
• linux linux kernel (< 6.1.141)
• linux linux kernel (>= 6.2 < 6.6.93)
• linux linux kernel (>= 6.7 < 6.12.31)
• linux linux kernel (>= 6.13 < 6.14.9)
• debian debian linux 11.0
References
- https://git.kernel.org/stable/c/631ca8909fd5c62b9fda9edda93924311a78a9c4 Patch
- https://git.kernel.org/stable/c/8c18c904d301ffeb33b071eadc55cd6131e1e9be Patch
- https://git.kernel.org/stable/c/bffd5f2815c5234d609725cd0dc2f4bc5de2fc67 Patch
- https://git.kernel.org/stable/c/c6f2694c580c27dca0cf7546ee9b4bfa6b940e38 Patch
- https://git.kernel.org/stable/c/dde4800d2b0f68b945fd81d4fc2d4a10ae25f743 Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html cert-portal.siemens.com