CVE-2025-38085

Advisory lineage Upstream: 0 Downstream: 71
Analyzed
Published: 28 Jun 2025, 07:44
Last modified:11 May 2026, 21:20

Vulnerability Summary

Overall Risk (default)
low
19/100
CVSS Score
4.7 MEDIUM
v3.1 (nvd)
EPSS Score
0.08% LOW
0% probability +0.06%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

28 Jun 2025, 07:44
Published
Vulnerability first disclosed
11 May 2026, 21:20
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.08%• Percentile: 25%

Techniques & Countermeasures

  • CWE-362•Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

    The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Affected Systems

  • debian•debian_linux

    11.0

  • linux•linux

    ≥ 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa, < 952596b08c74e8fe9e2883d1dc8a8f54a37384ec | ≥ 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa, < a3d864c901a300c295692d129159fc3001a56185 | ≥ 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa, < b7754d3aa7bf9f62218d096c0c8f6c13698fac8b | ≥ 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa, < fe684290418ef9ef76630072086ee530b92f02b8 | ≥ 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa, < 034a52b5ef57c9c8225d94e9067f3390bb33922f | ≥ 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa, < a6bfeb97941a9187833b526bc6cc4ff5706d0ce9 | ≥ 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa, < 1013af4f585fccc4d3e5c5824d174de2257f7d6d | 2.6.20

  • linux•linux_kernel

    ≥ 2.6.20, < 5.10.239 | ≥ 5.11, < 5.15.186 | ≥ 5.16, < 6.1.142 | ≥ 6.2, < 6.6.95 | ≥ 6.7, < 6.12.35 | ≥ 6.13, < 6.15.4

References (10)