DEBIAN-CVE-2025-38085
Record from OSV · Published June 28, 2025
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.
Fixed versions
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| Package | Ecosystem | Fixed in |
|---|---|---|
| linux | Debian:12 | 6.1.147-1 |
| linux | Debian:14 | 6.12.35-1 |
| linux | Debian:13 | 6.12.35-1 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Debian:12 | linux | 6.1.76-1, 0, 6.1.106-1 |
| Debian:14 | linux | 0 |
| Debian:13 | linux | 0 |
Timeline
- Jun 28, 2025 CVE Published
- Sep 1, 2026 CVE Updated
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