CVE-2025-38085

CVE Details

Release Date:	2025-06-28
Impact:	Moderate	What is this?

Description

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race huge_pmd_unshare() drops a reference on a page table that may have previously been shared across processes, potentially turning it into a normal page table used in another process in which unrelated VMAs can afterwards be installed. If this happens in the middle of a concurrent gup_fast(), gup_fast() could end up walking the page tables of another process. While I don't see any way in which that immediately leads to kernel memory corruption, it is really weird and unexpected. Fix it with an explicit broadcast IPI through tlb_remove_table_sync_one(), just like we do in khugepaged when removing page tables for a THP collapse.

See more information about CVE-2025-38085 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.1
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	High
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 10 (kernel)	ELSA-2025-13598	2025-08-15
Oracle Linux version 10 (kernel-uek)	ELSA-2025-20551	2025-09-08
Oracle Linux version 8 (kernel)	ELSA-2025-13589	2025-08-11
Oracle Linux version 8 (kernel-uek)	ELSA-2025-20552	2025-09-08
Oracle Linux version 9 (kernel)	ELSA-2025-13962	2025-08-19
Oracle Linux version 9 (kernel-uek)	ELSA-2025-20551	2025-09-08
Oracle Linux version 9 (kernel-uek)	ELSA-2025-20552	2025-09-08