Improper synchronization in Linux kernel - CVE-2026-89986
Published: September 16, 2026
Vulnerability identifier: #VU150304
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89986
CWE-ID: CWE-662
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to compromise confidentiality, integrity, and availability.
The vulnerability exists due to improper synchronization in alloc_pages_bulk_weighted_interleave() when allocating temporary node weights under an RCU read-side critical section. A local user can trigger the vulnerable allocation while using an MPOL_WEIGHTED_INTERLEAVE memory policy to compromise confidentiality, integrity, and availability.
Affected software
Linux kernel
How to mitigate CVE-2026-89986
Install security update from vendor's repository.