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01 Record

CVE-2026-35091

Corosync: corosync: denial of service and information disclosure via crafted udp packet

HighPUBLISHEDCNA: redhat
CNA base score8.2 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
View raw JSON

02 Description

Corosync: corosync: denial of service and information disclosure via crafted udp packet

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.86% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 58.4% of scored records. A rank, not a probability.
NVD base score
8.2 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-10-26.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-04-01 13:18Z7 MO AGO
Last updated
2026-08-21 12:15Z2 MO AGO
Reserved
2026-04-01
Assigning CNA
redhat
Record state
PUBLISHED
Severity
High (CVSS 8.2)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Weaknesses
  • CWE-253Incorrect Check of Function Return ValueBase
Data version
5.2
Document digest
bc6d7ce911bcb734b5286ce522a15b3d975625977c3940d4365e41a0bf823493

05 Affected products

VendorProductVersionsPlatforms
Red HatRed Hat Enterprise Linux 10Not specified—
Red HatRed Hat Enterprise Linux 10.0 Extended Update SupportNot specified—
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle SupportNot specified—
Red HatRed Hat Enterprise Linux 8Not specified—
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportNot specified—
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnNot specified—
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportNot specified—
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update ServiceNot specified—
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP SolutionsNot specified—
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update ServiceNot specified—
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP SolutionsNot specified—
Red HatRed Hat Enterprise Linux 9Not specified—
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP SolutionsNot specified—
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP SolutionsNot specified—
Red HatRed Hat Enterprise Linux 9.4 Extended Update SupportNot specified—
Red HatRed Hat Enterprise Linux 9.6 Extended Update SupportNot specified—
Red HatRed Hat OpenShift Container Platform 4Not specified—

06 References

07 Fixed in

AlmaLinux 8

  • corosync
    Fixed in 3.1.8-1.el8_10.1
  • corosync-vqsim
    Fixed in 3.1.8-1.el8_10.1
  • corosynclib
    Fixed in 3.1.8-1.el8_10.1
  • corosynclib-devel
    Fixed in 3.1.8-1.el8_10.1
  • spausedd
    Fixed in 3.1.8-1.el8_10.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • corosync
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el9_8.1
    • Affected before 3.1.9-2.el9_7.1
  • corosync-vqsim
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el9_8.1
    • Affected before 3.1.9-2.el9_7.1
  • corosynclib
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el9_8.1
    • Affected before 3.1.9-2.el9_7.1
  • corosynclib-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el9_8.1
    • Affected before 3.1.9-2.el9_7.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • corosync
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el10_2.1
    • Affected before 3.1.9-2.el10_1.1
  • corosync-vqsim
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el10_2.1
    • Affected before 3.1.9-2.el10_1.1
  • corosynclib
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el10_2.1
    • Affected before 3.1.9-2.el10_1.1
  • corosynclib-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el10_2.1
    • Affected before 3.1.9-2.el10_1.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • corosync
    Fixed in 3.1.8-1.el8_10.1
  • corosync-vqsim
    Fixed in 3.1.8-1.el8_10.1
  • corosynclib
    Fixed in 3.1.8-1.el8_10.1
  • corosynclib-devel
    Fixed in 3.1.8-1.el8_10.1
  • spausedd
    Fixed in 3.1.8-1.el8_10.1

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • corosync
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el9_8.1
    • Affected before 3.1.9-2.el9_7.1
  • corosync-vqsim
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el9_8.1
    • Affected before 3.1.9-2.el9_7.1
  • corosynclib
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el9_8.1
    • Affected before 3.1.9-2.el9_7.1
  • corosynclib-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el9_8.1
    • Affected before 3.1.9-2.el9_7.1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • corosync
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el10_2.1
    • Affected before 3.1.9-2.el10_1.1
  • corosync-vqsim
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el10_2.1
    • Affected before 3.1.9-2.el10_1.1
  • corosynclib
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el10_2.1
    • Affected before 3.1.9-2.el10_1.1
  • corosynclib-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 3.1.10-1.el10_2.1
    • Affected before 3.1.9-2.el10_1.1

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • corosync
    Fixed in 3.1.7-1+deb12u2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • corosync
    Fixed in 3.1.9-2+deb13u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • corosync
    Fixed in 3.1.10-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • corosync
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • corosync
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • corosync
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • corosync
    Fixed in 3.1.6-1ubuntu1.2

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • corosync
    Fixed in 3.1.7-1ubuntu3.2

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • corosync
    Fixed in 3.1.9-2ubuntu1.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.