SB2026062537 - Race condition in Linux kernel mm book3s64

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-53108)

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

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to a race condition in powerpc PMD huge page handling when unmapping memory during PMD page migration or device-private THP entry handling. A local user can trigger concurrent move_pages() and munmap() operations to cause a denial of service.

The issue can lead to a kernel BUG in pmdp_huge_get_and_clear_full() on powerpc/64s systems.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/829367e55012c053738ebe7db20c4a90d6609ece
• https://git.kernel.org/stable/c/bbcbf045d6c778e82b47a35fc8728387708e9a3d