SB2026102242 - Memory leak in Linux kernel kvm svm

Description

This security bulletin contains information about 1 vulnerability.

1) Memory leak (CVE-ID: CVE-2026-98472)

CWE-ID: CWE-401 - Missing release of memory 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 consume kernel memory and potentially cause a denial of service on the host.

The vulnerability exists due to a memory leak in the Linux kernel KVM SEV VM destruction path when destroying a VM that is no longer classified as an SEV VM following intra-host migration. A local user can repeatedly trigger this VM lifecycle to leave have_run_cpus CPU-mask allocations unreleased and potentially exhaust host memory.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/12c1f6e03f944e399bd2c88441dca5dc702b95a5
• https://git.kernel.org/stable/c/6aef7cf800098749ff5d660222efaf6e01e98c09
• https://git.kernel.org/stable/c/9784e5ca91b37b387f3f414af4340c54f7a63566