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{"acknowledgement": "Red Hat would like to thank Francisco Alisson Bezerra (TIM Security Red Team Research, TIM S.p.A), Lucas Gabriel Alves (TIM Security Red Team Research, TIM S.p.A), and Massimiliano Brolli (TIM Security Red Team Research, TIM S.p.A) for reporting this issue.", "bugzilla": {"description": "PCP: PCP: Privilege escalation to root via linux_sockets PMDA vulnerability", "id": "2506026", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506026"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-403", "details": ["A flaw in the PCP linux_sockets module exposes an unsecured internal connection.\nAn attacker with initial code execution can exploit this to escalate privileges and execute arbitrary commands as root."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-16526", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "pcp", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "pcp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "pcp", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "pcp", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "pcp", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-07-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-16526\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-16526"], "statement": "This is an Important privilege escalation vulnerability in PCP where an attacker can escalate privileges from the `pcp` user to `root`. This flaw requires a prior `linux_sockets` command injection vulnerability and a non-default configuration where the `linux_sockets` PMDA is loaded as a DSO in PMCD. Exploitation can occur locally or remotely depending on the `pmcd` and `pmproxy` configurations.", "threat_severity": "Important"}

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