CVE-2026-93228— svcrdma 拒绝段计数为0的写入/回复块漏洞
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，已解决以下漏洞： svcrdma：拒绝 segcount 为 0 的 Write/Reply 数据块 对等方可以发送一个 字段为零的 Write 或 Reply 数据块。 仅拒绝 的情况，因此零值会通过范围检查，而 会返回当前（非 NULL）光标，且不进行推进。该函数返回 true，随后 将一个 的 链接到 或 。 本系列中的一个较早补丁已使 对 安全，因此它不再驱动以往用于内存遍历的逻辑。在解码边界处拒绝格式错误的帧仍具有价值，作为纵深防御措施：它将退化的零段数据块完全排除在已解析的数据块
影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 78147ca8b4a9b6cf0e597ddd6bf17959e08376c2< fe533ae1bed2ef2b3d54ee7ab410da1874ed3d4f |
affected |
78147ca8b4a9b6cf0e597ddd6bf17959e08376c2< a798714b58041e88716db3bf8fb03ae13eecd54a |
affected | ||
78147ca8b4a9b6cf0e597ddd6bf17959e08376c2< 45dbdb2637b7fc5f1355b588780d2a7fb0516805 |
affected | ||
78147ca8b4a9b6cf0e597ddd6bf17959e08376c2< 9808eb7656666acc7291bae9ab6b987bd16e47e0 |
affected | ||
5.11 |
affected | ||
< 5.11 |
unaffected | ||
6.12.111≤ 6.12.* |
unaffected | ||
6.18.50≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-93228 基础信息
漏洞信息
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Vulnerability Title
svcrdma: Reject Write/Reply chunks with segcount 0
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
svcrdma: Reject Write/Reply chunks with segcount 0
A peer can send a Write or Reply chunk whose segcount field is zero.
xdr_check_write_chunk() only rejects segcount > rc_maxpages, so zero
passes the range check, and xdr_inline_decode(stream, 0) returns the
current (non-NULL) cursor without advancing. The function returns
true and pcl_alloc_write() then links a struct svc_rdma_chunk with
ch_segcount == 0 onto rc_write_pcl or rc_reply_pcl.
An earlier patch in this series made pcl_for_each_segment() safe for
ch_segcount == 0, so this no longer drives the memory walk it used
to. Rejecting the malformed frame at the decode boundary is still
worthwhile as defense in depth: it keeps degenerate zero-segment
chunks off the parsed chunk lists entirely, so any future consumer
that walks ch_segments directly cannot observe one, and it makes the
zero-floor easy to backport to trees where the macro change is more
intrusive. RFC 8166 has no meaning for a Write/Reply chunk that
describes no remote buffer, so no legitimate client is affected.
xdr_check_reply_chunk() funnels Reply chunks through
xdr_check_write_chunk() and inherits the same rejection.
pcl_alloc_write() also links each chunk onto the parsed chunk list
before filling its segment array. If a future change weakens the
segcount-0 rejection, an incomplete chunk is visible to consumers
during the fill loop. Reorder so that list_add_tail() follows the
segment fill loop, ensuring only fully-populated chunks appear on
the list.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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-2026-93228 的公开POC
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CVE-2026-93228 补丁与修复 (4)
同批安全公告 · Linux · 2026-09-24 · 共 234 条
| CVE-2026-93207 | 9.8 CRITICAL | SUNRPC svcauth_gss_decode_credbody() 存在安全漏洞 |
| CVE-2026-97413 | 9.8 CRITICAL | Linux RDMA/rtrs-srv整数下溢漏洞 |
| CVE-2026-93793 | 8.8 HIGH | iwlwifi 驱动 TX_CMD 响应布局验证漏洞 |
| CVE-2026-93799 | 8.8 HIGH | iwlwifi mvm BA窗口状态通知中sta_id验证漏洞 |
| CVE-2026-93790 | 8.8 HIGH | iwlwifi 驱动 BA 通知中 tid_data 越界访问漏洞 |
| CVE-2026-93806 | 8.8 HIGH | wifi: cfg80211 关联响应长度验证漏洞 |
| CVE-2026-97442 | 8.8 HIGH | ath11k无线驱动rx_h_undecap_nwifi无效数据访问漏洞 |
| CVE-2026-97409 | 8.8 HIGH | Linux NVMe-oF目标未初始化前取消请求漏洞 |
| CVE-2026-97509 | 8.8 HIGH | Thunderbolt 服务期间保持 XDomain 引用漏洞 |
| CVE-2026-93280 | 8.8 HIGH | Greybus 音频拓扑边界检查漏洞 |
| CVE-2026-93284 | 8.8 HIGH | drm/pagemap 迁移错误前未解除 dma 映射 |
| CVE-2026-97451 | 8.4 HIGH | ACPICA mid_op 整数溢出漏洞 |
| CVE-2026-97455 | 8.4 HIGH | ACPICA acpi_ds_terminate_control_method 使用后释放漏洞 |
| CVE-2026-97452 | 8.4 HIGH | ACPICA：防止添加无效引用 |
| CVE-2026-97450 | 8.4 HIGH | ACPICA 双重验证处理器对象类型漏洞 |
| CVE-2026-93827 | 8.4 HIGH | virtio-fs 队列设置失败时双重释放漏洞 |
| CVE-2026-97433 | 8.2 HIGH | NVMe 验证 FDP 配置描述符大小 |
| CVE-2026-93786 | 8.1 HIGH | ksmbd 保持 VFS 继承 POSIX ACL 掩码漏洞 |
| CVE-2026-93221 | 8.1 HIGH | NFS服务端标志位转换为无符号长整型 |
| CVE-2026-93224 | 8.1 HIGH | svcrdma 接受失败时未配对 rn_unregister 漏洞 |
显示前 20 条，共 234 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-93228
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