CVE-2026-16527

Summary

An unauthenticated remote attacker can bypass access controls by sending crafted requests to the PCP pmproxy /store endpoint. This allows the attacker to overwrite any PMDA metric, leading to arbitrary code execution and system takeover.

Affected Software

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 100:7.0.3-5.el10_2 < *unaffected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support0:6.3.7-1.el10_0.1 < *unaffected
Red HatRed Hat Enterprise Linux 80:5.3.7-22.el8_10.5 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support0:5.2.5-8.el8_4.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On0:5.2.5-8.el8_4.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support0:5.3.5-10.el8_6.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On0:5.3.5-10.el8_6.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service0:5.3.7-19.el8_8.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions0:5.3.7-19.el8_8.1 < *unaffected
Red HatRed Hat Enterprise Linux 90:6.3.7-8.el9_8.4 < *unaffected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions0:6.0.1-8.el9_2.2 < *unaffected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions0:6.2.0-5.el9_4.2 < *unaffected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support0:6.3.7-1.el9_6.1 < *unaffected

Weaknesses

  • CWE-306: Missing Authentication for Critical Function

Workarounds

To mitigate this issue, restrict network access to the pmproxy service (port 44322/TCP) to trusted hosts only using firewall rules. If pmproxy functionality is not required, disable the service. Disabling the service will prevent remote access to performance metrics via pmproxy. To disable the service, run: sudo systemctl stop pmproxy and sudo systemctl disable pmproxy. If firewalling, ensure to reload the firewall rules after making changes.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References