CVE-2026-98550— Linux 内核 TIPC 拒绝无效消息导致整数下溢漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
在 Linux 内核中，以下漏洞已被修复： tipc：拒绝无效和意外的 GRP_ACK_MSG，以防止 bc_ackers 下溢 提交 48a5fe38772b（"tipc: 修复因重复 GRP_ACK_MSG 导致的 bc_ackers 下溢”）通过在 中，当满足 条件时提前返回，从而拒绝处理重复或过期的 ACK 消息。 然而，该检查仍存在两个方面的不足： 1. 当 为零时（例如在静默组中、未请求 replicast ACK，或所有预期成员均已确认之后），若收到一个意外的 且其 ，该消息会通过 检查，并无条件地递
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 2f487712b89376fce267223bbb0db93d393d4b09< edc6593c442278fceff0120e8cc58bc592168c35 |
affected |
2f487712b89376fce267223bbb0db93d393d4b09< 9b94a90651e1fa573c6ac6a5a6b269d5874df2c0 |
affected | ||
2f487712b89376fce267223bbb0db93d393d4b09< 507a27435b2bb1f22e3a3674f6a6553eb815021b |
affected | ||
2f487712b89376fce267223bbb0db93d393d4b09< 80a9ccfc24d3776ef6753a57315e726475fac7d7 |
affected | ||
2f487712b89376fce267223bbb0db93d393d4b09< 478fb08d0c2a53002a721d22b8d6681ec971d90f |
affected | ||
2f487712b89376fce267223bbb0db93d393d4b09< 12cc3a1eac5a2a06b67a7b85f0f48ff241a94d1b |
affected | ||
2f487712b89376fce267223bbb0db93d393d4b09< b0e517961f09b9f60d338d1ea4e17aacdbf206f0 |
affected | ||
2f487712b89376fce267223bbb0db93d393d4b09< 99cc2a62e07a44a22254d7beca9ef1f8ad886d0d |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-98550 基础信息
漏洞信息
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Vulnerability Title
tipc: reject invalid and unexpected GRP_ACK_MSG to prevent bc_ackers underflow
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
tipc: reject invalid and unexpected GRP_ACK_MSG to prevent bc_ackers underflow
Commit 48a5fe38772b ("tipc: fix bc_ackers underflow on duplicate
GRP_ACK_MSG") rejected duplicate/stale ACKs in tipc_group_proto_rcv()
by returning early when less_eq(acked, m->bc_acked).
However, that check remains incomplete in two ways:
1. When grp->bc_ackers is zero (e.g. on a quiet group, when replicast
ACKs were not requested, or after all expected members have already
acknowledged), an unexpected GRP_ACK_MSG with acked > m->bc_acked
passes less_eq() and unconditionally decrements grp->bc_ackers.
Because bc_ackers is a u16, this wraps to 65535, causing
tipc_group_bc_cong() to permanently report congestion and blocking
all future group broadcasts on the socket.
2. During an active broadcast round (grp->bc_ackers > 0), the sender
transmits packet S and advances grp->bc_snd_nxt to S + 1. Receivers
increment their expected counter to S + 1 upon consuming packet S,
so the only valid ACK value for the current round is strictly
acked == grp->bc_snd_nxt.
However, tipc_group_update_bc_members() initializes each member's
m->bc_acked to prev = grp->bc_snd_nxt - 1 (S - 1 before increment).
This leaves a 2-sequence gap (S - 1 to S + 1) in sequence space.
An incoming ACK is therefore neither rejected as duplicate nor
prevented from decrementing grp->bc_ackers if an unexpected or stale
value (such as S) is received. A member sending acked = S followed
by acked = S + 1 could decrement grp->bc_ackers twice in the same
round, prematurely clearing bc_ackers or underflowing it.
Fix this by:
- Dropping GRP_ACK_MSG immediately if grp->bc_ackers is zero.
- Requiring acked == grp->bc_snd_nxt and rejecting duplicates where
m->bc_acked == acked. Because replicast broadcast rounds are strictly
sequential, only grp->bc_snd_nxt can be acknowledged, and each member
can acknowledge at most once per round.
Note that a related pre-existing issue in tipc_group_delete_member()
(where grp->bc_ackers decrementing to zero upon member departure does
not restore *grp->open or trigger a socket wakeup) will be addressed
in a separate patch.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-98550 的公开POC
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CVE-2026-98550 补丁与修复 (8)
同批安全公告 · Linux · 2026-10-18 · 共 436 条
| CVE-2026-98583 | NFC nfcmrvl 驱动命令长度校验越界漏洞 | |
| CVE-2026-98570 | Linux IPv6 子网路由表项处理信息泄露漏洞 | |
| CVE-2026-98571 | stmmac 驱动 skb 构建失败后内存泄漏漏洞 | |
| CVE-2026-98572 | bpf MIPS32 JEQ/JNE 跳转指令逻辑漏洞 | |
| CVE-2026-98573 | Linux 内核 IPv6 校验和计算整数下溢漏洞 | |
| CVE-2026-98574 | bcmgenet 网络驱动 NAPI 停止前禁用队列漏洞 | |
| CVE-2026-98575 | pn533 NFC 驱动越界读取漏洞 | |
| CVE-2026-98576 | Linux NFC LLCP 服务名日志越界读漏洞 | |
| CVE-2026-98577 | NFC LLCP 模块 WKS SAP 劫持漏洞 | |
| CVE-2026-98578 | Linux st21nfca ISO15693 库存长度验证漏洞 | |
| CVE-2026-98579 | NFC LLCP SDreq TLV 列表泄露漏洞 | |
| CVE-2026-98580 | Linux NFC LLCP 接受队列生命周期竞态条件漏洞 | |
| CVE-2026-98581 | NFC LLCP nfc_llcp_recv_dm 列表损坏/引用计数不同步 | |
| CVE-2026-98582 | ST21NFCA NFC 驱动接收帧大小验证漏洞 | |
| CVE-2026-98594 | tg3 驱动 PHYLIB 资源清理漏洞 | |
| CVE-2026-98591 | bpf skb 动态指针越界漏洞 | |
| CVE-2026-98592 | Spacemit 网络驱动传输描述符处理漏洞 | |
| CVE-2026-98593 | Linux s390 调试功能空指针解引用漏洞 | |
| CVE-2026-98590 | bpf 上下文代码生成逻辑修复 | |
| CVE-2026-98595 | Linux 内核 UDP 4 元组哈希表移除漏洞 |
显示前 20 条，共 436 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-98550
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