SB2026091229 - Improper initialization in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper initialization (CVE-ID: CVE-2026-89757)

CWE-ID: CWE-665 - Improper Initialization

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause incorrect memory-lock accounting.

The vulnerability exists due to improper initialization of mlock_count in sort_folio() when handling an unevictable folio on a generation list. A local user can lock and unlock memory associated with an affected folio to cause incorrect memory-lock accounting.

Concurrent LRU isolation can observe a folio after it has been removed from the generation list.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/15d3a2a71c8bf7333d019d249ee33669e69e4275
• https://git.kernel.org/stable/c/54a58d6656dd403b686b247f0bad8507cbfb45df
• https://git.kernel.org/stable/c/f7e698e326b239a91ea15844817551921209e826