Bug 2506032 (CVE-2026-16529) - CVE-2026-16529 PCP: PCP: Denial of Service due to signed integer overflow
Summary: CVE-2026-16529 PCP: PCP: Denial of Service due to signed integer overflow
Keywords:
Status: NEW
Alias: CVE-2026-16529
Deadline: 2026-07-30
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-22 07:49 UTC by OSIDB Bzimport
Modified: 2026-10-29 20:26 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:55560 0 None None None 2026-08-17 10:32:49 UTC
Red Hat Product Errata RHSA-2026:55617 0 None None None 2026-08-17 19:46:32 UTC
Red Hat Product Errata RHSA-2026:55740 0 None None None 2026-08-17 19:41:07 UTC
Red Hat Product Errata RHSA-2026:72272 0 None None None 2026-09-28 04:58:18 UTC
Red Hat Product Errata RHSA-2026:72273 0 None None None 2026-09-28 04:02:28 UTC
Red Hat Product Errata RHSA-2026:72593 0 None None None 2026-09-28 15:14:39 UTC
Red Hat Product Errata RHSA-2026:72594 0 None None None 2026-09-28 15:13:23 UTC
Red Hat Product Errata RHSA-2026:73767 0 None None None 2026-09-30 07:56:29 UTC
Red Hat Product Errata RHSA-2026:74612 0 None None None 2026-10-01 22:52:33 UTC
Red Hat Product Errata RHSA-2026:74613 0 None None None 2026-10-01 22:45:51 UTC

Description OSIDB Bzimport 2026-07-22 07:49:33 UTC 
Summary: A signed integer overflow in __pmGetPDU() (pdu.c:661) permanently corrupts
the process-wide static variable maxsize, rendering the affected daemon unable to read any
PDU for the remainder of its lifetime. No authentication or prior session state is required.
When php->len = 0x7FFFFFFF, the expression PDU_CHUNK * (1 + php->len / PDU_CHUNK)
overflows to -2147483648. Every subsequent call to __pmFindPDUBuf(maxsize) returns
NULL, causing silent connection failures. Two attack vectors were confirmed: pmlogger TCP
4330 (conditional on PMLOGGER_LOCAL being unset) and pmcd TCP 44321 during SASL
negotiation.
Prerequisites: Vector 1 (pmlogger TCP 4330): Default installation, no credentials required.
Bound to loopback by default; remotely exploitable only if PMLOGGER_LOCAL is unset.
Vector 2 (pmcd TCP 44321): SASL configured (standard in major distro packages). Bound to
loopback by default; remotely exploitable only if the operator altered the binding
configuration.
Comment 1 errata-xmlrpc 2026-08-17 10:32:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:55560 https://access.redhat.com/errata/RHSA-2026:55560
Comment 2 errata-xmlrpc 2026-08-17 19:41:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:55740 https://access.redhat.com/errata/RHSA-2026:55740
Comment 3 errata-xmlrpc 2026-08-17 19:46:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:55617 https://access.redhat.com/errata/RHSA-2026:55617
Comment 4 Jon Orris 2026-09-28 04:02:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:72273 https://access.redhat.com/errata/RHSA-2026:72273
Comment 5 Jon Orris 2026-09-28 04:58:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:72272 https://access.redhat.com/errata/RHSA-2026:72272
Comment 6 Jon Orris 2026-09-28 15:13:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:72594 https://access.redhat.com/errata/RHSA-2026:72594
Comment 7 Jon Orris 2026-09-28 15:14:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:72593 https://access.redhat.com/errata/RHSA-2026:72593
Comment 8 Jon Orris 2026-09-30 07:56:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:73767 https://access.redhat.com/errata/RHSA-2026:73767
Comment 10 Jon Orris 2026-10-01 22:45:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:74613 https://access.redhat.com/errata/RHSA-2026:74613
Comment 11 Jon Orris 2026-10-01 22:52:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:74612 https://access.redhat.com/errata/RHSA-2026:74612
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