Integer underflow in Linux kernel - CVE-2026-43286
Published: May 9, 2026
Vulnerability identifier: #VU130895
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-43286
CWE-ID: CWE-191
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-43286
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3