CVE-2026-31662 (GCVE-0-2026-31662)
Vulnerability from cvelistv5
Published
2026-04-24 14:45
Modified
2026-10-19 18:56
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: tipc: fix bc_ackers underflow on duplicate GRP_ACK_MSG The GRP_ACK_MSG handler in tipc_group_proto_rcv() currently decrements bc_ackers on every inbound group ACK, even when the same member has already acknowledged the current broadcast round. Because bc_ackers is a u16, a duplicate ACK received after the last legitimate ACK wraps the counter to 65535. Once wrapped, tipc_group_bc_cong() keeps reporting congestion and later group broadcasts on the affected socket stay blocked until the group is recreated. Fix this by ignoring duplicate or stale ACKs before touching bc_acked or bc_ackers. This makes repeated GRP_ACK_MSG handling idempotent and prevents the underflow path.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2f487712b89376fce267223bbb0db93d393d4b09
Version: 2f487712b89376fce267223bbb0db93d393d4b09
Version: 2f487712b89376fce267223bbb0db93d393d4b09
Version: 2f487712b89376fce267223bbb0db93d393d4b09
Version: 2f487712b89376fce267223bbb0db93d393d4b09
Version: 2f487712b89376fce267223bbb0db93d393d4b09
Version: 2f487712b89376fce267223bbb0db93d393d4b09
Version: 2f487712b89376fce267223bbb0db93d393d4b09
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  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.