CVE-2026-98550: tipc: reject invalid and unexpected GRP_ACK_MSG to prevent bc_ackers underflow

Overview

Severity

Medium (CVSS 5.3)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploit Status

Not Exploited

Patch Tuesday

2026-Oct

Released

2026-10-20

EPSS Score

0.21% (percentile: 10.6%)

Affected Products (1)

Other

• 21932-17084

Revision History

• 2026-10-20: Information published.