High [CVE-2026-64558] Check length in pkey_pckmo handler implementation
This high-severity Red Hat Linux advisory covers CVE-2026-64558 affecting Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat Enterprise Linux 10, Red Hat package: kernel-rt.
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Summary
In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in pkey_pckmo handler implementation Explicitly check the length of the target buffer in the pkey_pckmo implementation of the key_to_protkey() handler function. The handler function fails, if the generated output data exceeds the length of the provided target buffer.
A flaw was found in the Linux kernel, specifically within the s390/pkey component. This could allow a local attacker to cause a denial of service.
Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-787.
Affected Red Hat products: Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9. Red Hat lists Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8 as not affected.
Red Hat fixing advisory: RHSA-2026:74174.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
- kernel-0:5.14.0-570.146.1.el9_6
- RHSA-2026:74174
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:5.14.0-570.146.1.el9_6, RHSA-2026:74174. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
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