CVE-2026-31662
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
tipc: fix bc_ackers underflow on duplicate GRP_ACK_MSG
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 2f487712b89376fce267223bbb0db93d393d4b09 | affected | git | a7db57ccca21f5801609065473c89a38229ecb92 | Unavailable | None listed |
| 2f487712b89376fce267223bbb0db93d393d4b09 | affected | git | 36ec4fdd6250dcd5e73eb09ea92ed92e9cc28412 | Unavailable | None listed |
| 2f487712b89376fce267223bbb0db93d393d4b09 | affected | git | 575faea557f1a184a5f09661bd47ebd3ef3769f8 | Unavailable | None listed |
| 2f487712b89376fce267223bbb0db93d393d4b09 | affected | git | 3bcf7aca63f0bcd679ae28e9b99823c608e59ce3 | Unavailable | None listed |
| 2f487712b89376fce267223bbb0db93d393d4b09 | affected | git | a2ea1ef0167d7a84730638d05c20ccdc421b14b6 | Unavailable | None listed |
| 2f487712b89376fce267223bbb0db93d393d4b09 | affected | git | 1b6f13f626665cac67ba5a012765427680518711 | Unavailable | None listed |
| 2f487712b89376fce267223bbb0db93d393d4b09 | affected | git | e0bb732eaf77f9ac2f2638bdac9e39b81e0a9682 | Unavailable | None listed |
| 2f487712b89376fce267223bbb0db93d393d4b09 | affected | git | 48a5fe38772b6f039522469ee6131a67838221a8 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.15 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.15 | Unavailable | None listed |
| 5.10.253 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.203 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.169 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.135 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.82 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.23 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 6.19.13 | unaffected | semver | Unavailable | 6.19.* | None listed |
| 7.0 | unaffected | original_commit_for_fix | Unavailable | * | None listed |