CVE-2025-39754
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-11

Last updated on: 2025-11-26

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mm/smaps: fix race between smaps_hugetlb_range and migration smaps_hugetlb_range() handles the pte without holdling ptl, and may be concurrenct with migration, leaing to BUG_ON in pfn_swap_entry_to_page(). The race is as follows. smaps_hugetlb_range migrate_pages huge_ptep_get remove_migration_ptes folio_unlock pfn_swap_entry_folio BUG_ON To fix it, hold ptl lock in smaps_hugetlb_range().
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Meta Information
Published
2025-09-11
Last Modified
2025-11-26
Generated
2026-06-16
AI Q&A
2025-09-11
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39754
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel 6.17
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-362 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.
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Executive Summary

This vulnerability is a race condition in the Linux kernel's memory management code, specifically between the smaps_hugetlb_range() function and the migration process. The smaps_hugetlb_range() function handles page table entries (pte) without holding the page table lock (ptl), which can concurrently occur with page migration operations. This race can lead to a kernel BUG_ON error in pfn_swap_entry_to_page(), causing system instability or crashes. The fix involves holding the ptl lock in smaps_hugetlb_range() to prevent this race.

Impact Analysis

This vulnerability can cause system instability or crashes due to a race condition in memory management. If exploited or triggered, it may lead to kernel panics or unexpected behavior, potentially resulting in denial of service or data loss on affected Linux systems.

Mitigation Strategies

Apply the patch that fixes the race condition in smaps_hugetlb_range by holding the ptl lock as described. This involves updating the Linux kernel to a version where this issue is resolved.

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