CVE-2026-98550High· 7.5▾ TwilightA flaw was found in the TIPC (Transparent Inter-Process Communication) subsystem of the Linux kernel. This flaw allows an attacker to cause a Denial of Service (DoS) by sending unexpected or duplicate group acknowledgment messages. Due to …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 20.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 7.5
none → high
Last analysed / modified upstream
0.2% → 0.7%
A flaw was found in the TIPC (Transparent Inter-Process Communication) subsystem of the Linux kernel. This flaw allows an attacker to cause a Denial of Service (DoS) by sending unexpected or duplicate group acknowledgment messages. Due to improper validation of incoming protocol messages, an internal acknowledgment counter can underflow, permanently placing the socket into a congested state and blocking all subsequent broadcast communication.
kernel: tipc: reject invalid and unexpected GRP_ACK_MSG to prevent bc_ackers underflow — rated Important by Red Hat. Released 2026-10-18, updated 2026-10-24.
Affected:
No fix planned:
Not affected:
Affected
Workarounds / mitigations:
The highest-value action is to enforce strict sequence verification and reject unexpected GRP_ACK_MSG messages in…
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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