CVE-2026-16526

Summary

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 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-403: Exposure of File Descriptor to Unintended Control Sphere ('File Descriptor Leak')

Workarounds

To mitigate this vulnerability, ensure that the linux_sockets PMDA is not configured to load as a Dynamic Shared Object (DSO) within PMCD. The default configuration for this PMDA is daemon mode, which is not affected by this flaw. Review your pmcd.conf file to confirm the linux_sockets PMDA is not loaded as a DSO. If changes are made to pmcd.conf, a restart of the pmcd service is required for them to take effect.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References