CVE-2026-93830— Net stmmac xgmac2默认RX中断屏蔽中禁用RBUE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： net: stmmac: xgmac2：在默认接收（RX）中断掩码中禁用 RBUE 启用“接收缓冲区不可用”（RX Buffer Unavailable, RBUE）中断不仅无益，反而会在高接收负载下触发 MAC 中断风暴。当 DMA 耗尽接收描述符（descriptors）时，会持续触发 RBUE 中断，直到软件重新填充接收环。 然而，RBUE 是冗余的：常规的接收完成中断（RIE）已能触发 NAPI 子系统，后者处理已完成的描述符并重新填充接收环，从而使 DMA 恢复运
可能的 ATT&CK 技术 1 AI
T1499 · Endpoint Denial of Service影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | d6ddfacd95c79d43465d4a85dffb1c9beca343a9< 8c9d57b5dc098b84631d0b3559c84c499ea2170a |
affected |
d6ddfacd95c79d43465d4a85dffb1c9beca343a9< 7a10e54e42a8f73a8d731f5a281fc06bb41b9250 |
affected | ||
d6ddfacd95c79d43465d4a85dffb1c9beca343a9< 6b3b91433d5f4eae6865cdaa96f40cd67849e1f6 |
affected | ||
d6ddfacd95c79d43465d4a85dffb1c9beca343a9< 74dbb85a6a254b5fc1f265a6cd61b2ba9d9221d7 |
affected | ||
d6ddfacd95c79d43465d4a85dffb1c9beca343a9< 0b1a5d3647ce07c27a9fffefc11a8cbf7d7b25ce |
affected | ||
d6ddfacd95c79d43465d4a85dffb1c9beca343a9< 87e2826ed2058747ddf014c082569a46bfadd96b |
affected | ||
d6ddfacd95c79d43465d4a85dffb1c9beca343a9< d3265c19b35d036bba327b36b5366bee76b0157c |
affected | ||
4.19 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2026-93830 基础信息
漏洞信息
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Vulnerability Title
net: stmmac: xgmac2: disable RBUE in default RX interrupt mask
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: stmmac: xgmac2: disable RBUE in default RX interrupt mask
Enabling the RX Buffer Unavailable (RBUE) interrupt is counterproductive
and can trigger a MAC interrupt storm under heavy RX pressure. When the
DMA runs out of RX descriptors it fires RBUE continuously until software
refills the ring.
However, RBUE is redundant: the normal RX completion interrupt (RIE)
already triggers NAPI, which processes completed descriptors and refills
the ring, causing the DMA to resume. The RBUE handler itself only sets
handle_rx - the same outcome as RIE.
On Agilex5 under heavy RX pressure, the MAC interrupt (which includes
RBUE) was observed firing 1,821,811,555 times against only 2,618,627
actual RX completions - a ~695x ratio - confirming the severity of the
storm.
RBUE does not provide OOM recovery. If page_pool is exhausted,
stmmac_rx_refill() cannot advance the DMA tail pointer, the DMA stays
suspended, and RBUE fires again on the next NAPI completion - a storm
with no forward progress. This patch trades that storm for a clean
stall with the same RX outcome. Proper OOM recovery is a pre-existing
gap outside the scope of this fix.
Note: as a consequence of disabling RBUE, the rx_buf_unav_irq ethtool
counter will always read 0 on XGMAC2 devices. This behaviour is already
inconsistent across DWMAC core versions.
Remove RBUE from XGMAC_DMA_INT_DEFAULT_EN and XGMAC_DMA_INT_DEFAULT_RX
to prevent the interrupt storm while keeping normal RX handling intact.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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-2026-93830 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-93830 补丁与修复 (7)
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-2026-93228 | 9.1 CRITICAL | svcrdma 拒绝段计数为0的写入/回复块漏洞 |
| CVE-2026-93799 | 8.8 HIGH | iwlwifi mvm BA窗口状态通知中sta_id验证漏洞 |
| CVE-2026-97442 | 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-2026-93806 | 8.8 HIGH | wifi: cfg80211 关联响应长度验证漏洞 |
| CVE-2026-93793 | 8.8 HIGH | iwlwifi 驱动 TX_CMD 响应布局验证漏洞 |
| CVE-2026-93790 | 8.8 HIGH | iwlwifi 驱动 BA 通知中 tid_data 越界访问漏洞 |
| CVE-2026-93284 | 8.8 HIGH | drm/pagemap 迁移错误前未解除 dma 映射 |
| CVE-2026-93280 | 8.8 HIGH | Greybus 音频拓扑边界检查漏洞 |
| CVE-2026-97509 | 8.8 HIGH | Thunderbolt 服务期间保持 XDomain 引用漏洞 |
| CVE-2026-93827 | 8.4 HIGH | virtio-fs 队列设置失败时双重释放漏洞 |
| CVE-2026-97452 | 8.4 HIGH | ACPICA：防止添加无效引用 |
| CVE-2026-97451 | 8.4 HIGH | ACPICA mid_op 整数溢出漏洞 |
| CVE-2026-97450 | 8.4 HIGH | ACPICA 双重验证处理器对象类型漏洞 |
| CVE-2026-97455 | 8.4 HIGH | ACPICA acpi_ds_terminate_control_method 使用后释放漏洞 |
| CVE-2026-97433 | 8.2 HIGH | NVMe 验证 FDP 配置描述符大小 |
| CVE-2026-93787 | 8.1 HIGH | CIFS cifs_filldir 中目录项名称越界访问漏洞 |
| CVE-2026-93786 | 8.1 HIGH | ksmbd 保持 VFS 继承 POSIX ACL 掩码漏洞 |
显示前 20 条，共 234 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-93830
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