A vulnerability classified as very critical was found in Linux Kernel up to 6.12.96/6.18.39/7.1.4. This affects the function
PKEY_VERIFYPROTK of the component s390/pkey. The manipulation results in buffer overflow.
This vulnerability is identified as CVE-2026-64559. The attack is only possible with local access. There is not any exploit available.
Upgrading the affected component is advised.
