CVE-2026-89593

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89593

Key Details

CVE	CVE-2026-89593
CVSS Score / Version	7.1 (High) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89593
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89593

Source

Reference

NVD

CVE