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CVE-2026-16527 Red Hat CVE debrief

CVE-2026-16527 debrief based on the supplied source corpus. The vulnerability allows unauthenticated remote attackers to bypass access controls by sending crafted requests to the PCP pmproxy /store endpoint, potentially leading to arbitrary code execution and system takeover on Red Hat Enterprise Linux 10 systems. Defenders should verify system exposure, prioritize patching, and monitor for suspicious activity related to PMDA metrics. This CVE has a CVSS score of 7.3 and is considered HIGH severity.

Vendor
Red Hat
Product
Red Hat Enterprise Linux 10
CVSS
HIGH 7.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-30
Original CVE updated
2026-09-28
Advisory published
2026-07-30
Advisory updated
2026-09-28

Who should care

Red Hat Enterprise Linux 10 system administrators and defenders should prioritize patching and verify system exposure. They should also monitor for suspicious activity related to PMDA metrics and review compensating controls for exposed systems. Security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented.

Why it matters

CVE-2026-16527 allows unauthenticated remote attackers to bypass access controls and potentially execute arbitrary code on Red Hat Enterprise Linux 10 systems. Defenders should verify system exposure, prioritize patching, and monitor for suspicious activity.

  • Potential system takeover due to arbitrary code execution
  • Verification of PMDA metric integrity and system monitoring
  • Prioritized patching and remediation of vulnerable systems

Technical summary

An unauthenticated remote attacker can bypass access controls by sending crafted requests to the PCP pmproxy /store endpoint, allowing the attacker to overwrite any PMDA metric. This could lead to arbitrary code execution and system takeover on Red Hat Enterprise Linux 10 systems. The vulnerability has a CVSS score of 7.3 and is considered HIGH severity. Defenders should prioritize patching and monitor for suspicious activity related to PMDA metrics. Red Hat has released several errata related to this CVE: RHSA-2026:55560, RHSA-2026:55617, RHSA-2026:55740, RHSA-2026:72272, RHSA-2026:72273, RHSA-2026:72593, and RHSA-2026:72594.

Defensive priority

High priority for Red Hat Enterprise Linux 10 defenders

Recommended defensive actions

  • Review and apply Red Hat errata RHSA-2026:55560, RHSA-2026:55617, RHSA-2026:55740, RHSA-2026:72272, RHSA-2026:72273, RHSA-2026:72593, and RHSA-2026:72594
  • Verify and restrict access to the PCP pmproxy /store endpoint
  • Monitor system logs for suspicious activity related to PMDA metrics
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. Red Hat has released several errata related to this CVE: RHSA-2026:55560, RHSA-2026:55617, RHSA-2026:55740, RHSA-2026:72272, RHSA-2026:72273, RHSA-2026:72593, and RHSA-2026:72594. Defenders should review these errata and verify system exposure. The vulnerability affects Red Hat Enterprise Linux 10 systems. There is no information on known or unknown affected scope beyond Red Hat Enterprise Linux 10. Defenders should verify PMDA metric integrity and monitor system logs.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-16527 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-16527

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-16527 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-16527

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.