CVE-2026-35091 (GCVE-0-2026-35091)

Vulnerability from cvelistv5 – Published: 2026-04-01 13:18 – Updated: 2026-05-29 16:21
VLAI
Title
Corosync: corosync: denial of service and information disclosure via crafted udp packet
Summary
A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-253 - Incorrect Check of Function Return Value
Assigner
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:13644 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13657 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13673 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14205 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14210 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14211 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14212 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14213 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14214 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14215 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14216 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19043 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19200 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20916 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-35091 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2453169
https://bugzilla.redhat.com/show_bug.cgi?id=2453813 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:3.1.9-2.el10_1.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.1
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:3.1.10-1.el10_2.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:3.1.9-1.el10_0.2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support Unaffected: 0:2.4.5-7.el7_9.3 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:7::server
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:3.1.8-1.el8_10.1 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/a:redhat:enterprise_linux:8::crb
    cpe:/a:redhat:enterprise_linux:8::highavailability
    cpe:/a:redhat:enterprise_linux:8::resilientstorage
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 0:3.1.0-3.el8_4.2 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.4::appstream
    cpe:/a:redhat:rhel_aus:8.4::highavailability
    cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.4::highavailability
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 0:3.1.0-3.el8_4.2 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.4::appstream
    cpe:/a:redhat:rhel_aus:8.4::highavailability
    cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.4::highavailability
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 0:3.1.5-2.el8_6.1 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_e4s:8.6::appstream
    cpe:/a:redhat:rhel_e4s:8.6::highavailability
    cpe:/a:redhat:rhel_tus:8.6::appstream
    cpe:/a:redhat:rhel_tus:8.6::highavailability
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service Unaffected: 0:3.1.5-2.el8_6.1 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_e4s:8.6::appstream
    cpe:/a:redhat:rhel_e4s:8.6::highavailability
    cpe:/a:redhat:rhel_tus:8.6::appstream
    cpe:/a:redhat:rhel_tus:8.6::highavailability
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions Unaffected: 0:3.1.5-2.el8_6.1 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_e4s:8.6::appstream
    cpe:/a:redhat:rhel_e4s:8.6::highavailability
    cpe:/a:redhat:rhel_tus:8.6::appstream
    cpe:/a:redhat:rhel_tus:8.6::highavailability
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 0:3.1.7-1.el8_8.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_e4s:8.8::highavailability
    cpe:/a:redhat:rhel_tus:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::highavailability
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 0:3.1.7-1.el8_8.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_e4s:8.8::highavailability
    cpe:/a:redhat:rhel_tus:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::highavailability
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:3.1.9-2.el9_7.1 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/a:redhat:enterprise_linux:9::crb
    cpe:/a:redhat:enterprise_linux:9::highavailability
    cpe:/a:redhat:enterprise_linux:9::resilientstorage
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:3.1.10-1.el9_8.1 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/a:redhat:enterprise_linux:9::crb
    cpe:/a:redhat:enterprise_linux:9::highavailability
    cpe:/a:redhat:enterprise_linux:9::resilientstorage
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Unaffected: 0:3.1.5-3.el9_0.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.0::appstream
    cpe:/a:redhat:rhel_e4s:9.0::highavailability
    cpe:/a:redhat:rhel_e4s:9.0::resilientstorage
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:3.1.7-1.el9_2.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2::appstream
    cpe:/a:redhat:rhel_e4s:9.2::highavailability
    cpe:/a:redhat:rhel_e4s:9.2::resilientstorage
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Unaffected: 0:3.1.8-1.el9_4.1 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.4::appstream
    cpe:/a:redhat:rhel_eus:9.4::crb
    cpe:/a:redhat:rhel_eus:9.4::highavailability
    cpe:/a:redhat:rhel_eus:9.4::resilientstorage
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:3.1.9-2.el9_6.1 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6::appstream
    cpe:/a:redhat:rhel_eus:9.6::crb
    cpe:/a:redhat:rhel_eus:9.6::highavailability
    cpe:/a:redhat:rhel_eus:9.6::resilientstorage
 Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
 Create a notification for this product.
Date Public
2026-04-01 11:48
Credits
Red Hat would like to thank Sebastián Alba Vives for reporting this issue.
Show details on NVD website
To clipboard 

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\"cpe:/a:redhat:rhel_eus:9.6::resilientstorage\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 9.6 Extended Update Support\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"0:3.1.9-2.el9_6.1\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"corosync\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:openshift:4\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenShift Container Platform 4\", \"packageName\": \"rhcos\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-04-01T11:31:01.742Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2026-04-01T11:48:13.254Z\", \"value\": \"Made public.\"}], \"datePublic\": \"2026-04-01T11:48:13.254Z\", \"references\": [{\"url\": \"https://access.redhat.com/errata/RHSA-2026:13644\", \"name\": \"RHSA-2026:13644\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:13657\", \"name\": \"RHSA-2026:13657\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:13673\", \"name\": \"RHSA-2026:13673\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14205\", \"name\": \"RHSA-2026:14205\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14210\", \"name\": \"RHSA-2026:14210\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14211\", \"name\": \"RHSA-2026:14211\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14212\", \"name\": \"RHSA-2026:14212\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14213\", \"name\": \"RHSA-2026:14213\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14214\", \"name\": \"RHSA-2026:14214\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14215\", \"name\": \"RHSA-2026:14215\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14216\", \"name\": \"RHSA-2026:14216\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:19043\", \"name\": \"RHSA-2026:19043\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:19200\", \"name\": \"RHSA-2026:19200\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:20916\", \"name\": \"RHSA-2026:20916\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2026-35091\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2453169\"}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2453813\", \"name\": \"RHBZ#2453813\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Systems using totemudp or totemudpu should migrate to the supported knet transport and enable encryption.\\n\\nDisabling the Corosync service is a valid workaround if clustering is not required, but for active clusters, enabling encryption via knet is the preferred and recommended approach.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-253\", \"description\": \"Incorrect Check of Function Return Value\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-05-29T16:21:39.121Z\"}, \"x_redhatCweChain\": \"CWE-253: Incorrect Check of Function Return Value\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-35091\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-29T16:21:39.121Z\", \"dateReserved\": \"2026-04-01T11:35:23.145Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-04-01T13:18:53.738Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.