Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-07-29T00:00:00 kernel: s390/pkey: Check length in PKEY_VERIFYPROTK ioctl 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CWE-805

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.

A flaw was found in the Linux kernel. A missing buffer length check in the `PKEY_VERIFYPROTK ioctl` within the `s390/pkey` module allows a local attacker to provide a buffer length request that exceeds the allocated buffer size. This could lead to information disclosure by reading out-of-bounds memory or a denial of service by crashing the system.

Red Hat Enterprise Linux 10 Affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Affected kernel Red Hat Enterprise Linux 9 Affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-64559 https://nvd.nist.gov/vuln/detail/CVE-2026-64559 https://lore.kernel.org/linux-cve-announce/2026072914-CVE-2026-64559-839b@gregkh/T