CVE-2026-98373
Description
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.
How to fix
- Linux Linuxab4f0f68cf4773dc0513baccbbe790c80a301773, cf73ef2a761df9329af116c905a7a94b317921e4, 7a96b0f657c8d799ea5b8e02fc9ec7cca0e6e7ff, 850cc4a84b36a0062dcd0391acd2450e20ab0767, 480a39b0a12c977ed6e755f3d12a23424c57d11f, 9bdad082d44bdcf93716973dcba6be77e8a06e7b or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | e95a9851787bbb3cd4deb40fe8bab03f731852d1 ≤ v < ab4f0f68cf4773dc0513baccbbe790c80a301773, e95a9851787bbb3cd4deb40fe8bab03f731852d1 ≤ v < cf73ef2a761df9329af116c905a7a94b317921e4, e95a9851787bbb3cd4deb40fe8bab03f731852d1 ≤ v < 7a96b0f657c8d799ea5b8e02fc9ec7cca0e6e7ff, e95a9851787bbb3cd4deb40fe8bab03f731852d1 ≤ v < 850cc4a84b36a0062dcd0391acd2450e20ab0767, e95a9851787bbb3cd4deb40fe8bab03f731852d1 ≤ v < 480a39b0a12c977ed6e755f3d12a23424c57d11f, e95a9851787bbb3cd4deb40fe8bab03f731852d1 ≤ v < 9bdad082d44bdcf93716973dcba6be77e8a06e7b, 6.0 | ab4f0f68cf4773dc0513baccbbe790c80a301773, cf73ef2a761df9329af116c905a7a94b317921e4, 7a96b0f657c8d799ea5b8e02fc9ec7cca0e6e7ff, 850cc4a84b36a0062dcd0391acd2450e20ab0767, 480a39b0a12c977ed6e755f3d12a23424c57d11f, 9bdad082d44bdcf93716973dcba6be77e8a06e7b |
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