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VulnerabilityPublished Updated

CVE-2026-16526: CWE-403

Source GCVE Database

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Authoritative record:CVE-2026-16526· High 8.8

Not known to be exploited · CVSS 8.8 High.

Data as of 29 Oct 2026, 07:15 UTC

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 47% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Enterprise Linux 10pcpAffected–Fixed in–
Red Hat Enterprise Linux 10.0 Extended Update SupportpcpAffected–Fixed in–
Red Hat Enterprise Linux 8pcpAffected–Fixed in–
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportpcpAffected–Fixed in–
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnpcpAffected–Fixed in–
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportpcpAffected–Fixed in–

AI-suggested

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 runs the PMDA in daemon mode, which is not vulnerable. Administrators should review the pmcd.conf file to confirm the linux_sockets PMDA is not loaded as a DSO. If changes are made, the pmcd service must be restarted for the changes to take effect.

Description

CVE-2026-16526 is a privilege escalation vulnerability in the PCP linux_sockets module. It exposes an unsecured internal connection that allows an attacker with initial code execution to escalate privileges from the pcp user to root and execute arbitrary commands. Exploitation requires a non-default configuration where the linux_sockets PMDA is loaded as a Dynamic Shared Object (DSO) in PMCD. The default daemon mode configuration is not affected.

References

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