CVE-2026-99166— Linux RDS 模块 CM 事件处理器未初始化解引用漏洞
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，以下漏洞已得到修复： net: rds: 修复 CM 事件处理程序中对未初始化 的解引用问题 函数仅在 RDMA 设备为 InfiniBand CA（即 ）时才会对 进行赋值。对于其他类型的设备（例如 iWARP RNIC，如 ）， 将保持未初始化状态，但事件切换逻辑却会无条件地解引用该变量：在 情况下，通过 无条件访问；在 和 情况下（需具备连接上下文），也会对其进行访问。 因此，运行在 iWARP 设备上的 RDS 监听器在收到连接请求时，会立即导致内核崩溃：若启用了 配置，该非法读取将
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | dcdede0406d30e14a6ed727dce69dfac0518371d< 5f23e4e3a31dacfd82a8f56be253adc0910ee84f |
affected |
dcdede0406d30e14a6ed727dce69dfac0518371d< ca14c289ed9ffed6cc64290d039e923e5720a8bf |
affected | ||
dcdede0406d30e14a6ed727dce69dfac0518371d< 492ba6ac1b1ffb8a06ff52db0825c1af2cdb28c8 |
affected | ||
4.6 |
affected | ||
< 4.6 |
unaffected | ||
6.18.59≤ 6.18.* |
unaffected | ||
7.2.13≤ 7.2.* |
unaffected | ||
7.3≤ * |
unaffected |
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一、 漏洞 CVE-2026-99166 基础信息
漏洞信息
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Vulnerability Title
net: rds: fix uninitialized trans dereference in CM event handler
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: rds: fix uninitialized trans dereference in CM event handler
rds_rdma_cm_event_handler_cmn() assigns trans only when the RDMA
device is an InfiniBand CA (RDMA_NODE_IB_CA). On any other device
type, e.g. an iWARP RNIC such as siw, trans stays uninitialized, but
the event switch dereferences it: unconditionally in the
RDMA_CM_EVENT_CONNECT_REQUEST case via trans->cm_handle_connect(),
and (with a connection context) in the ROUTE_RESOLVED and
ESTABLISHED cases.
An RDS listener on an iWARP device therefore crashes the kernel as
soon as a connect request arrives: with CONFIG_INIT_STACK_ALL_ZERO
the wild load becomes a NULL dereference at offset 0xa0
(&trans->cm_handle_connect) in the iw_cm_wq workqueue.
GCC masks the bug in default builds by folding the uninitialized
load into &rds_ib_transport; Clang-built kernels take the real
uninitialized path and oops.
The active side can land on a non-IB device too: the id that
rds_ib_conn_path_connect() creates is not restricted to a node type,
so rdma_resolve_addr() binds it to whichever device serves the local
address, and an iWARP RNIC on the same netdev qualifies. The crash
there is different: resolving a route on an iWARP id never fills in
cm_id->route.path_rec, and the ROUTE_RESOLVED case writes
path_rec[0].sl before it calls into the transport.
The iWARP transport was dropped long ago and IB is the only
transport left, so make that explicit: initialize trans to
&rds_ib_transport at declaration, drop the conditional assignment,
reject a connect request that arrives on a non-IB device, and drop a
connection whose address resolved to one instead of resolving a
route on it. The rejection is limited to RDMA_CM_EVENT_CONNECT_REQUEST
on purpose: a non-zero return from the handler makes rdma_cm destroy
the id the event was delivered on, which is right for the request's
freshly created id but would free a connection id that RDS still owns
for any other event. On the active side the id stays ic->i_cm_id and
the connection's shutdown destroys it, so that case returns 0.
[achender: reject only on RDMA_CM_EVENT_CONNECT_REQUEST instead of
bailing out for every event on a non-IB device, so that rdma_cm does
not destroy connection ids RDS still tracks; drop a connection whose
address resolved to a non-IB device before a route is resolved on it;
changelog adjusted]
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-2026-99166 的公开POC
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CVE-2026-99166 补丁与修复 (3)
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