SB20261022126 - Integer underflow in Linux kernel tipc

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Main Vulnerability Database SB20261022126

SB20261022126 - Integer underflow in Linux kernel tipc

Published: October 22, 2026

Security Bulletin ID SB20261022126
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Integer underflow (CVE-ID: CVE-2026-98550)

CWE-ID: CWE-191 - Integer underflow

CVSSv4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker on the local network to cause a denial of service by blocking future TIPC group broadcasts on an affected socket.

The vulnerability exists due to integer underflow caused by incomplete acknowledgment validation in tipc_group_proto_rcv() when processing TIPC group acknowledgment messages. A remote attacker on the local network can send unexpected or incorrectly sequenced GRP_ACK_MSG messages to decrement the broadcast acknowledgment counter improperly, potentially wrapping it to 65535 and causing persistent congestion on the affected socket.


Remediation

Install update from vendor's website.

References