CVE-2026-89593 Linux Kernel - Resource Management Vulnerability

Linux kernel contains a memory reservation underflow vulnerability caused by improper adjustment of hugetlb reservations during unmapping when mapcount is not zero, letting attackers cause resource mismanagement, exploit requires specific memory mapping conditions.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.12% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Resource Management Vulnerability
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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