CVE-2026-16526: CWE-403
Source GCVE Database
Not known to be exploited · CVSS 8.8 High.
Data as of 29 Oct 2026, 07:15 UTC
- 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:HExploitation evidence
Disclosed: evidence found.
CVE published 30 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10pcp | Affected– | Fixed in– |
| Red Hat Enterprise Linux 10.0 Extended Update Supportpcp | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8pcp | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportpcp | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onpcp | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportpcp | Affected– | 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
- nvd.nist.gov/vuln/detail/CVE-2026-16526 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-16526 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2506026 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:55560 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:55617 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:55740 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:72272 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:72273 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:72593 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:72594 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:73767 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:74612 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:74613 (opens in a new tab)