Linux kernel mremap hugetlb address delta bug triggers kernel panic
CVE-2026-98373 Published on October 7, 2026
mm/hugetlb: preserve mremap address delta when skipping page tables
In the Linux kernel, the following vulnerability has been resolved:
mm/hugetlb: preserve mremap address delta when skipping page tables
move_hugetlb_page_tables() optimizes mremap() by advancing to the last
entry in the page table when the source page table does not exist, either
initially or after unsharing a PMD table. The common loop increment then
steps to the first entry in the next page table.
However, the code advances both the source and destination addresses to
the last entries in their respective page tables, which is wrong. The
destination address must be advanced only by the same amount as the source
address.
If the source and destination offsets within their page tables differ, the
destination address can be advanced too far, causing follow-up issues.
Fix this by advancing the destination address by the source advance
distance.
With a reproducer, we were able to trigger a kernel panic on x86-64. With
this fix in place, we can no longer reproduce the issue.
Products Associated with CVE-2026-98373
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Affected Versions
Linux:- Version e95a9851787bbb3cd4deb40fe8bab03f731852d1 and below 7a96b0f657c8d799ea5b8e02fc9ec7cca0e6e7ff is affected.
- Version e95a9851787bbb3cd4deb40fe8bab03f731852d1 and below 850cc4a84b36a0062dcd0391acd2450e20ab0767 is affected.
- Version e95a9851787bbb3cd4deb40fe8bab03f731852d1 and below 480a39b0a12c977ed6e755f3d12a23424c57d11f is affected.
- Version e95a9851787bbb3cd4deb40fe8bab03f731852d1 and below 9bdad082d44bdcf93716973dcba6be77e8a06e7b is affected.
- Version 6.0 is affected.
- Before 6.0 is unaffected.
- Version 6.12.112, <= 6.12.* is unaffected.
- Version 6.18.55, <= 6.18.* is unaffected.
- Version 7.2.9, <= 7.2.* is unaffected.
- Version 7.3-rc5, <= * is unaffected.