SB20260816203 - Missing Release of Resource after Effective Lifetime in Linux kernel s390 kvm

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-74514)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

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 improper resource management in KVM s390 PCI memory accounting functions when accounting and unaccounting pinned pages. A local user can trigger page pinning and unpinning operations to cause a denial of service.

The issue can be triggered when unaccounting occurs in a different process context than the one that originally pinned the pages.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/36f6999ecde3976731a8bfc0b8e667da6f593069
• https://git.kernel.org/stable/c/70871b121f81d08879363cb1238a4c85c5c2800c
• https://git.kernel.org/stable/c/e3f732e086e438c52c7400bd2734bb166aa4752c