Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 2f487712b89376fce267223bbb0db93d393d4b09 before a7db57ccca21f5801609065473c89a38229ecb92; affected 2f487712b89376fce267223bbb0db93d393d4b09 before 36ec4fdd6250dcd5e73eb09ea92ed92e9cc28412; affected 2f487712b89376fce267223bbb0db93d393d4b09 before 575faea557f1a184a5f09661bd47ebd3ef3769f8; affected 2f487712b89376fce267223bbb0db93d393d4b09 before 3bcf7aca63f0bcd679ae28e9b99823c608e59ce3; affected 2f487712b89376fce267223bbb0db93d393d4b09 before a2ea1ef0167d7a84730638d05c20ccdc421b14b6; affected 2f487712b89376fce267223bbb0db93d393d4b09 before 1b6f13f626665cac67ba5a012765427680518711; affected 2f487712b89376fce267223bbb0db93d393d4b09 before e0bb732eaf77f9ac2f2638bdac9e39b81e0a9682; affected 2f487712b89376fce267223bbb0db93d393d4b09 before 48a5fe38772b6f039522469ee6131a67838221a8 |
| Linux / Linux | affected 4.15; unaffected 0 before 4.15; unaffected 5.10.253 through 5.10.*; unaffected 5.15.203 through 5.15.*; unaffected 6.1.169 through 6.1.*; unaffected 6.6.135 through 6.6.*; unaffected 6.12.82 through 6.12.*; unaffected 6.18.23 through 6.18.*; unaffected 6.19.13 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.
No references supplied.