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CVE-2026-16526: Pcp: pcp: privilege escalation to root via linux_sockets pmda vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-30 · updated 2026-10-02
• Weakness: CWE-403

Description

A flaw in the PCP linux_sockets module exposes an unsecured internal connection. An attacker with initial code execution can exploit this to escalate privileges and execute arbitrary commands as root.

Affected products

• Red Hat Enterprise Linux 10: all versions — fixed in 0:7.0.3-5.el10_2
• Red Hat Enterprise Linux 10.0 Extended Update Support: all versions — fixed in 0:6.3.7-1.el10_0.1
• Red Hat Enterprise Linux 7: all versions
• Red Hat Enterprise Linux 8: all versions — fixed in 0:5.3.7-22.el8_10.5
• Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: all versions — fixed in 0:5.2.5-8.el8_4.1
• Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: all versions — fixed in 0:5.2.5-8.el8_4.1
• Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: all versions — fixed in 0:5.3.5-10.el8_6.1
• Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On: all versions — fixed in 0:5.3.5-10.el8_6.1
• Red Hat Enterprise Linux 8.8 Telecommunications Update Service: all versions — fixed in 0:5.3.7-19.el8_8.1
• Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: all versions — fixed in 0:5.3.7-19.el8_8.1
• Red Hat Enterprise Linux 9: all versions — fixed in 0:6.3.7-8.el9_8.4
• Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: all versions — fixed in 0:6.0.1-8.el9_2.2
• Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions: all versions — fixed in 0:6.2.0-5.el9_4.2
• Red Hat Enterprise Linux 9.6 Extended Update Support: all versions — fixed in 0:6.3.7-1.el9_6.1

How to fix

Upgrade to a fixed version: Red Hat Enterprise Linux 10 0:7.0.3-5.el10_2; Red Hat Enterprise Linux 10.0 Extended Update Support 0:6.3.7-1.el10_0.1; Red Hat Enterprise Linux 8 0:5.3.7-22.el8_10.5; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:5.2.5-8.el8_4.1; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:5.2.5-8.el8_4.1; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:5.3.5-10.el8_6.1; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:5.3.5-10.el8_6.1; Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:5.3.7-19.el8_8.1; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:5.3.7-19.el8_8.1; Red Hat Enterprise Linux 9 0:6.3.7-8.el9_8.4; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:6.0.1-8.el9_2.2; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:6.2.0-5.el9_4.2. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2026:55560
• https://access.redhat.com/errata/RHSA-2026:55617
• https://access.redhat.com/errata/RHSA-2026:55740
• https://access.redhat.com/errata/RHSA-2026:72272
• https://access.redhat.com/errata/RHSA-2026:72273
• https://access.redhat.com/errata/RHSA-2026:72593
• https://access.redhat.com/errata/RHSA-2026:72594
• https://access.redhat.com/errata/RHSA-2026:73767
• https://access.redhat.com/errata/RHSA-2026:74612
• https://access.redhat.com/errata/RHSA-2026:74613
• https://access.redhat.com/security/cve/CVE-2026-16526
• https://bugzilla.redhat.com/show_bug.cgi?id=2506026

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