What is CVE-2026-64559?

CVE-2026-64559 is a high-severity vulnerability in Linux. CVSS score: 7.8/10. Published 2026-07-29.

How severe is CVE-2026-64559?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Linux

CVE-2026-64559

In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in PKEY_VERIFYPROTK ioctl Explicitly check the buffer length request structure provided by user-space and fail, if it exceeds the buffer size.

EPSS: 0.001 (2.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions 7.2-rc1, 6.12, 7.2

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67

Frequently asked questions

What is CVE-2026-64559?: CVE-2026-64559 is a high-severity vulnerability in Linux. CVSS score: 7.8/10. Published 2026-07-29.
How severe is CVE-2026-64559?: High severity. CVSS v3 base score is 7.8 out of 10.