Answer in brief
CVE-2025-38084 records a High severity (CVSS 7.8) vulnerability in mm/hugetlb: unshare page tables during VMA split, not before. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <e8847d18cd9fff1edbb45e963d9141273c3b539c || >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <366298f2b04d2bf1f2f2b7078405bdf9df9bd5d0 || >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <2511ac64bc1617ca716d3ba8464e481a647c1902 || >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <af6cfcd0efb7f051af221c418ec8b37a10211947 || >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <9cf5b2a3b72c23fb7b84736d5d19ee6ea718762b || >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <8a21d5584826f4880f45bbf8f72375f4e6c0ff2a || >=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <081056dc00a27bccb55ccc3c6f230a3d5fd3f7e0 | e8847d18cd9fff1edbb45e963d9141273c3b539c, 366298f2b04d2bf1f2f2b7078405bdf9df9bd5d0, 2511ac64bc1617ca716d3ba8464e481a647c1902, af6cfcd0efb7f051af221c418ec8b37a10211947, 9cf5b2a3b72c23fb7b84736d5d19ee6ea718762b, 8a21d5584826f4880f45bbf8f72375f4e6c0ff2a, 081056dc00a27bccb55ccc3c6f230a3d5fd3f7e0 |
| Linux/Linuxgeneric | 2.6.20 | Not reported |
Published upstream
Jun 28, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: unshare page tables during VMA split, not before Currently, __split_vma() triggers hugetlb page table unsharing through vm_ops->may_split(). This happens before the VMA lock and rmap locks are taken - which is too early, it allows racing VMA-locked page faults in our process and racing rmap walks from other processes to cause page tables to be shared again before we actually perform the split. Fix it by explicitly calling into the hugetlb unshare logic from __split_vma() in the same place where THP splitting also happens. At that point, both the VMA and the rmap(s) are write-locked. An annoying detail is that we can now call into the helper hugetlb_unshare_pmds() from two different locking contexts: 1. from hugetlb_split(), holding: - mmap lock (exclusively) - VMA lock - file rmap lock (exclusively) 2. hugetlb_unshare_all_pmds(), which I think is designed to be able to call us with only the mmap lock held (in shared mode), but currently only runs while holding mmap lock (exclusively) and VMA lock Backporting note: This commit fixes a racy protection that was introduced in commit b30c14cd6102 ("hugetlb: unshare some PMDs when splitting VMAs"); that commit claimed to fix an issue introduced in 5.13, but it should actually also go all the way back. [[email protected]: v2]
Quoted source text, attributed separately from HOL analysis.