SB2026082849 - Race condition in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-80719)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 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]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in the mglru page table walker and reset_batch_size() when batching per-generation size deltas concurrently with memcg reparenting. A local user can trigger memory management activity to cause a denial of service.

The issue can lead to underestimated nr_pages in MGLRU, resulting in premature out-of-memory conditions.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/de4660898b7aa7e03d3b120a6bfa6b26211e4e77
• https://git.kernel.org/stable/c/fceb6b7f3ddec6ea9fc11577f4cf1b2da73a3101