VulnerabilityPublished 18 Jun 2025Updated 5 Nov 2026

CVE-2025-38071: Linux kernel · x86/mm: Check return value from memblock_phys_alloc_range()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in dde4800d2b0f68b945fd81d4fc2d4a10ae25f743 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:04 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch

Available – fixed in dde4800d2b0f68b945fd81d4fc2d4a10ae25f743, c6f2694c580c27dca0cf7546ee9b4bfa6b940e38, bffd5f2815c5234d609725cd0dc2f4bc5de2fc67 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Jun 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ a7259df7670240ee03b0cfce8a3e5d3773911e24, < dde4800d2b0f68b945fd81d4fc2d4a10ae25f743	Fixed in dde4800d2b0f68b945fd81d4fc2d4a10ae25f743
LinuxLinux	Affected ≥ a7259df7670240ee03b0cfce8a3e5d3773911e24, < c6f2694c580c27dca0cf7546ee9b4bfa6b940e38	Fixed in c6f2694c580c27dca0cf7546ee9b4bfa6b940e38
LinuxLinux	Affected ≥ a7259df7670240ee03b0cfce8a3e5d3773911e24, < bffd5f2815c5234d609725cd0dc2f4bc5de2fc67	Fixed in bffd5f2815c5234d609725cd0dc2f4bc5de2fc67
LinuxLinux	Affected ≥ a7259df7670240ee03b0cfce8a3e5d3773911e24, < 631ca8909fd5c62b9fda9edda93924311a78a9c4	Fixed in 631ca8909fd5c62b9fda9edda93924311a78a9c4
LinuxLinux	Affected ≥ a7259df7670240ee03b0cfce8a3e5d3773911e24, < 8c18c904d301ffeb33b071eadc55cd6131e1e9be	Fixed in 8c18c904d301ffeb33b071eadc55cd6131e1e9be
LinuxLinux	Affected =5.15	Fixed in–

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.

References

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