CVE-2026-81666
CVE CVE-2026-81666EUVD EUVD-2026-70987Published 2026-09-04T09:46:06.000ZLast changed 2026-09-08T14:41:40.000ZCVSS 6.5
What the advisory describes
An integer overflow was found in Corosync's handling of membership commit token messages. The length-validation check for these messages can be bypassed on 32-bit systems due to an integer overflow in the calculation of the expected message length, allowing a crafted network packet to trigger an out-of-bounds memory access that crashes the Corosync daemon. This results in a denial of service for the affected cluster node. The overflow does not occur on 64-bit systems, where the length calculation is correctly performed in 64-bit arithmetic.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Red Hat — Red Hat Enterprise Linux 10
- Red Hat — Red Hat Enterprise Linux 7
- Red Hat — Red Hat Enterprise Linux 8
- Red Hat — Red Hat Enterprise Linux 9
- Red Hat — Red Hat OpenShift Container Platform 4
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Red Hat — Red Hat Enterprise Linux
- Red Hat — Red Hat OpenShift Container Platform
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