SB2026102245 - Double free in Linux kernel s390 crypto driver

Description

This security bulletin contains information about 1 vulnerability.

1) Double free (CVE-ID: CVE-2026-98473)

CWE-ID: CWE-415 - Double Free

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to potentially cause a denial of service through a double-free during resource cleanup.

The vulnerability exists due to a potential double-free in the Linux kernel s390 vfio-ap function vfio_ap_free_aqic_resources() when cleanup runs after vfio_ap_mdev_unset_kvm() has cleared the KVM pointer. A local user can exercise repeated resource cleanup under this teardown condition to encounter a saved_isc value that was not invalidated, potentially causing a double-free and a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3c3433657c82f200dae36c29e2b80681c81b85be
• https://git.kernel.org/stable/c/65e05ec252a9b79e75930d3c4dd42d8877db04c5
• https://git.kernel.org/stable/c/cf441a0db681dfad5e89b015d6be11365159d7a9
• https://git.kernel.org/stable/c/da69d3ac53490724eba0ade9deb4e539a6ae9034