SB20260626198 - Improper control of a resource through its lifetime in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-53154)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

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 improper state management in mm/hugetlb.c hugetlb folio copy paths when handling failed hugetlb folio copy operations. A local user can trigger a failed UFFDIO_COPY operation or a fork-time copy-on-write path failure to cause a denial of service.

The issue can leak a reservation from a private hugetlb VMA reserve map, which may cause a later fault at the same address to take the no-reservation path and receive SIGBUS under hugetlb pool pressure.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/40c81856e622a9dc59294a90d169ac07ea25b0b0
• https://git.kernel.org/stable/c/45e33d43243d71d089af42f5077b8213cee6610f
• https://git.kernel.org/stable/c/8d6e1dd3ad1340cd8b6d554b7aa93d8f0a1c6d38
• https://git.kernel.org/stable/c/c72469ac0f274bde3f0df60a4584e14a123d0aa6
• https://git.kernel.org/stable/c/e47bf16af3c45470ea32f2241fa69aefe0dd61bd