CVE-2026-81666: Integer Overflow or Wraparound in Red Hat Red Hat Enterprise Linux 10
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.
CVE-2026-81666: Integer Overflow or Wraparound in Red Hat Red Hat Enterprise Linux 10
Description
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.
CVSS v3.1
Score 6.5medium
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-08-27T10:38:28.793Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-81666","vendor":"Red Hat"}]
Threat ID: 6a9a94e8acd9273b4963218c
Added to database: 09/04/2026, 09:52:40 UTC
Last updated: 09/04/2026, 11:04:41 UTC
Views: 5
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