CVE-2026-16524

Summary

A command injection flaw in PCP's linux_sockets PMDA allows malicious shell metacharacters via the network.persocket.filter metric. This failed validation lets attackers execute arbitrary commands as the PMDA user when metrics refresh.

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-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Workarounds

To prevent exploitation, restrict access to the pmstore utility by configuring the [access] section in /etc/pcp/pmcd/pmcd.conf. If the linux_sockets PMDA is not essential, it can be unloaded or disabled to remove the attack vector. After modifying pmcd.conf, the pmcd service must be restarted for changes to take effect.

ADP Enrichment

CISA ADP Vulnrichment

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

References