CVE-2025-38071: debian debian_linux
Vulnerability summary
CVE-2025-38071 is a medium (CVSS 5.5) vulnerability in debian debian_linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 25 · Related 23Timeline
- 18-06-2025PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
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 metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.18%
Chance of exploitation in the next 30 days
Percentile
8%
Versus all other CVEs
30-day change
0.00 pp
From 0.18% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu146 products
- linuxAll versions (No fix recorded) | < 6.8.0-100.100
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 6.8.0-1046.49
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.147-1 | < 6.12.32-1
- debian_linuxEOL11.0
Linux2 products
- linux≥ a7259df7670240ee03b0cfce8a3e5d3773911e24, < 8c18c904d301ffeb33b071eadc55cd6131e1e9be | ≥ a7259df7670240ee03b0cfce8a3e5d3773911e24, < bffd5f2815c5234d609725cd0dc2f4bc5de2fc67 | ≥ a7259df7670240ee03b0cfce8a3e5d3773911e24, < c6f2694c580c27dca0cf7546ee9b4bfa6b940e38 | ≥ a7259df7670240ee03b0cfce8a3e5d3773911e24, < dde4800d2b0f68b945fd81d4fc2d4a10ae25f743 | ≥ a7259df7670240ee03b0cfce8a3e5d3773911e24, < 631ca8909fd5c62b9fda9edda93924311a78a9c4 | 5.15
- linux_kernel< 6.1.141 | ≥ 6.2, < 6.6.93 | ≥ 6.7, < 6.12.31 | ≥ 6.13, < 6.14.9
3 vendors · 150 products
References
35 links- lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory