Bug 2453813 (CVE-2026-35091) - CVE-2026-35091 corosync: Corosync: Denial of Service and information disclosure via crafted UDP packet
Summary: CVE-2026-35091 corosync: Corosync: Denial of Service and information disclosu...
Keywords:
Status: NEW
Alias: CVE-2026-35091
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2453815
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-01 11:31 UTC by OSIDB Bzimport
Modified: 2026-05-26 14:26 UTC (History)
3 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-2026:13644 0 None None None 2026-05-05 09:18:44 UTC
Red Hat Product Errata RHSA-2026:13657 0 None None None 2026-05-05 10:04:51 UTC
Red Hat Product Errata RHSA-2026:13673 0 None None None 2026-05-05 10:23:47 UTC
Red Hat Product Errata RHSA-2026:14205 0 None None None 2026-05-06 15:47:19 UTC
Red Hat Product Errata RHSA-2026:14210 0 None None None 2026-05-06 16:15:29 UTC
Red Hat Product Errata RHSA-2026:14211 0 None None None 2026-05-06 16:10:45 UTC
Red Hat Product Errata RHSA-2026:14212 0 None None None 2026-05-06 16:27:52 UTC
Red Hat Product Errata RHSA-2026:14213 0 None None None 2026-05-06 16:30:23 UTC
Red Hat Product Errata RHSA-2026:14214 0 None None None 2026-05-06 16:20:07 UTC
Red Hat Product Errata RHSA-2026:14215 0 None None None 2026-05-06 16:15:05 UTC
Red Hat Product Errata RHSA-2026:14216 0 None None None 2026-05-06 16:25:55 UTC
Red Hat Product Errata RHSA-2026:19043 0 None None None 2026-05-19 13:06:28 UTC
Red Hat Product Errata RHSA-2026:19200 0 None None None 2026-05-19 18:00:56 UTC
Red Hat Product Errata RHSA-2026:20916 0 None None None 2026-05-26 14:26:19 UTC

Description OSIDB Bzimport 2026-04-01 11:31:24 UTC 
Wrong return value vulnerability in the Corosync membership commit token sanity check in exec/totemsrp.c. The flaw occurs in check_memb_commit_token_sanity() where truncated messages (msg_len < sizeof(struct memb_commit_token)) incorrectly return 0 (success) instead of -1 (failure). As a result, message_handler_memb_commit_token() continues processing attacker-controlled, undersized input, performs an allocation based on the short length, and then accesses struct memb_commit_token fields beyond the allocated region, triggering an out-of-bounds read (ASAN-confirmed). This can be exploited remotely without authentication in totemudp/totemudpu mode by sending a single crafted UDP packet to the Corosync port (default 5405), causing a denial of service and potentially leaking limited memory contents.
Comment 2 errata-xmlrpc 2026-05-05 09:18:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:13644 https://access.redhat.com/errata/RHSA-2026:13644
Comment 3 errata-xmlrpc 2026-05-05 10:04:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:13657 https://access.redhat.com/errata/RHSA-2026:13657
Comment 4 errata-xmlrpc 2026-05-05 10:23:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:13673 https://access.redhat.com/errata/RHSA-2026:13673
Comment 5 errata-xmlrpc 2026-05-06 15:47:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:14205 https://access.redhat.com/errata/RHSA-2026:14205
Comment 6 errata-xmlrpc 2026-05-06 16:10:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:14211 https://access.redhat.com/errata/RHSA-2026:14211
Comment 7 errata-xmlrpc 2026-05-06 16:15:04 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-2026:14215 https://access.redhat.com/errata/RHSA-2026:14215
Comment 8 errata-xmlrpc 2026-05-06 16:15:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:14210 https://access.redhat.com/errata/RHSA-2026:14210
Comment 9 errata-xmlrpc 2026-05-06 16:20:05 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 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:14214 https://access.redhat.com/errata/RHSA-2026:14214
Comment 10 errata-xmlrpc 2026-05-06 16:25:54 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-2026:14216 https://access.redhat.com/errata/RHSA-2026:14216
Comment 11 errata-xmlrpc 2026-05-06 16:27:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:14212 https://access.redhat.com/errata/RHSA-2026:14212
Comment 12 errata-xmlrpc 2026-05-06 16:30:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:14213 https://access.redhat.com/errata/RHSA-2026:14213
Comment 13 errata-xmlrpc 2026-05-19 13:06:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:19043 https://access.redhat.com/errata/RHSA-2026:19043
Comment 14 errata-xmlrpc 2026-05-19 18:00:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:19200 https://access.redhat.com/errata/RHSA-2026:19200
Comment 15 errata-xmlrpc 2026-05-26 14:26:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:20916 https://access.redhat.com/errata/RHSA-2026:20916
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