SB20260916129 - Improper synchronization in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper synchronization (CVE-ID: CVE-2026-89986)

CWE-ID: CWE-662 - Improper Synchronization

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0ceda28f371df9e0bbdaa29214f71fe8298f23d8
• https://git.kernel.org/stable/c/2943f1f4b7f2816177060eb9f551f2e6d8b629ba
• https://git.kernel.org/stable/c/540e583b66d6402bf556fde5e53c817a54c1afe5
• https://git.kernel.org/stable/c/bcb3d0c867ee40dc48e9c085bf328fbc679b6656