SB2026062539 - Improper control of a resource through its lifetime in Linux kernel powerpc mm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-53109)

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 pte_frag_destroy when freeing cached page table fragments during process exit. A local user can trigger process exit with a crafted memory state to cause a denial of service.

The issue affects the powerpc page table fragment handling path for hash with 64K page size and can occur in a corner case involving deferred PTE table freeing in parallel with do_exit().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/a32db6fca3c74b4eb8bae5470f0680deb4cbac6f
• https://git.kernel.org/stable/c/c8b710655012a2993a9567873fb71a8a51f8459c
• https://git.kernel.org/stable/c/fda4d71651f71c44b35829d13f3c8bf920032f77