Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
2f487712b89376fce267223bbb0db93d393d4b09 to < a7db57ccca21f5801609065473c89a38229ecb92affected2f487712b89376fce267223bbb0db93d393d4b09 to < 36ec4fdd6250dcd5e73eb09ea92ed92e9cc28412affected2f487712b89376fce267223bbb0db93d393d4b09 to < 575faea557f1a184a5f09661bd47ebd3ef3769f8affected2f487712b89376fce267223bbb0db93d393d4b09 to < 3bcf7aca63f0bcd679ae28e9b99823c608e59ce3affected2f487712b89376fce267223bbb0db93d393d4b09 to < a2ea1ef0167d7a84730638d05c20ccdc421b14b6affected2f487712b89376fce267223bbb0db93d393d4b09 to < 1b6f13f626665cac67ba5a012765427680518711affected2f487712b89376fce267223bbb0db93d393d4b09 to < e0bb732eaf77f9ac2f2638bdac9e39b81e0a9682affected2f487712b89376fce267223bbb0db93d393d4b09 to < 48a5fe38772b6f039522469ee6131a67838221a8affected
Linux Linux
Default version status: affected
4.15affected0 to < 4.15unaffected5.10.253 to ≤ 5.10.*unaffected5.15.203 to ≤ 5.15.*unaffected6.1.169 to ≤ 6.1.*unaffected6.6.135 to ≤ 6.6.*unaffected6.12.82 to ≤ 6.12.*unaffected6.18.23 to ≤ 6.18.*unaffected6.19.13 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/a7db57ccca21f5801609065473c89a38229ecb92 ↗
- https://git.kernel.org/stable/c/36ec4fdd6250dcd5e73eb09ea92ed92e9cc28412 ↗
- https://git.kernel.org/stable/c/575faea557f1a184a5f09661bd47ebd3ef3769f8 ↗
- https://git.kernel.org/stable/c/3bcf7aca63f0bcd679ae28e9b99823c608e59ce3 ↗
- https://git.kernel.org/stable/c/a2ea1ef0167d7a84730638d05c20ccdc421b14b6 ↗
- https://git.kernel.org/stable/c/1b6f13f626665cac67ba5a012765427680518711 ↗
- https://git.kernel.org/stable/c/e0bb732eaf77f9ac2f2638bdac9e39b81e0a9682 ↗
- https://git.kernel.org/stable/c/48a5fe38772b6f039522469ee6131a67838221a8 ↗