SB2026091822 - Incorrect calculation in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Incorrect calculation (CVE-ID: CVE-2026-93197)

CWE-ID: CWE-682 - Incorrect Calculation

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 a denial of service.

The vulnerability exists due to incorrect LRU size accounting in lruvec_reparent_lru() and lru_gen_reparent_memcg() when reparenting LRU folios during memory cgroup offlining. A local user can offline a memory cgroup to cause a denial of service.

The offlined cgroup can retain stale LRU size counters while it remains subject to memory-cgroup iteration and reclaim scanning.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/007bc1842317bb99f5f6205afede940f951674c2
• https://git.kernel.org/stable/c/0e0ac326c511d514817cc7b6d7741afd59098ce2