Integer underflow in Linux kernel - CVE-2026-43286
Published: May 9, 2026
Vulnerability identifier: #VU130895
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43286
CWE-ID: CWE-191
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an integer underflow in hugetlb subpool reservation accounting when handling failed hugeTLB page allocations from the global pool. A local user can trigger failed allocation attempts to cause a denial of service.
Repeated failed allocation attempts can permanently exhaust the subpool's used counter, making the subpool unusable even though no hugeTLB pages are actually consumed.
How to mitigate CVE-2026-43286
Install security update from vendor's repository.