CVEvulnerability
CVE-2026-89593
7.1 HIGH
Official page ↗
- Status
- Received
- Published
- 2026-09-11
- Last modified
- 2026-10-19
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
- 7.1 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Description
In the Linux kernel, the following vulnerability has been resolved:
hugetlb: only adjust reservation during unmapping if mapcount is 0
Since df7a6d1f6405, __unmap_hugepage_range can adjust reservations. In
the case of folio mapped in both a parent and a child, if the parent
unmaps the range first, the reservation adjustment will result in an
underflow of the reserved count. Once the child unmaps the range, the
count is restored. Change __unmap_hugepage_range() to check the mapcount
before adjusting the reservation.
References
- https://git.kernel.org/stable/c/0f001491e5a2ec69aa9d5dd6b799e5742245f9ea git.kernel.org
- https://git.kernel.org/stable/c/5120b1e048d48596ffaec1a8412012a91adba73b git.kernel.org
- https://git.kernel.org/stable/c/a3c65af20cceb7f997847727636b4017326f845d git.kernel.org
- https://git.kernel.org/stable/c/b0b1b9ca80b795ed2223e76dd787db7067121fb9 git.kernel.org