CVE-2026-98556— gve DQO 拒绝超限 MSS TSO 数据包漏洞
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： gve: DQO：拒绝 MSS 超出范围的 TSO 数据包 函数指出该设备要求 MSS（最大分段大小）必须小于或等于 9728 字节，但该函数并未强制执行此限制，而是假设由 Hypervisor 强制执行的 9K MTU 以及 TSO 大小的 64KB 上限已足够安全。 然而，这一假设对于非本地生成的数据包并不成立。位于 TAP 设备后方的虚拟机，或任何使用数据包套接字（packet socket）的用户，均可在 中提供任意值的 。二层转发路径不会检查 GSO 数据包的
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | a57e5de476be0b4b7f42beb6a21c19ad9c577aa3< 2dc3ae3942e151fef254b7bbb65c832192ad2069 |
affected |
a57e5de476be0b4b7f42beb6a21c19ad9c577aa3< c517e8755960c8c6335ebf7dae6c95c43e5fb085 |
affected | ||
a57e5de476be0b4b7f42beb6a21c19ad9c577aa3< 296c83b5ccc808c080865eb20fd7a477b0355bb7 |
affected | ||
5.14 |
affected | ||
< 5.14 |
unaffected | ||
6.18.55≤ 6.18.* |
unaffected | ||
7.2.9≤ 7.2.* |
unaffected | ||
7.3-rc5≤ * |
unaffected |
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一、 漏洞 CVE-2026-98556 基础信息
漏洞信息
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Vulnerability Title
gve: DQO: reject TSO packets with an out of range MSS
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
gve: DQO: reject TSO packets with an out of range MSS
gve_prep_tso() notes that the device requires the MSS to be <= 9728,
but does not enforce it, assuming the 9K MTU enforced by the hypervisor
and the 64KB limit on TSO sizes are enough.
This does not hold for packets that were not generated locally.
A guest behind a tap, or any packet socket user, can provide an
arbitrary gso_size in virtio_net_hdr. Layer 2 forwarding does not check
the MTU for GSO packets (is_skb_forwardable()), and gso_features_check()
only bounds skb->len and gso_segs, never gso_size.
Such a packet reaches gve_tx_fill_tso_ctx_desc(), which puts gso_size
into the mss field of the TSO context descriptor. This field is 14 bits
wide, so a gso_size of 16384 is silently turned into an MSS of zero.
Drop these packets from gve_prep_tso(), and make sure that
gve_features_check_dqo() leaves their GSO bits alone: skb_segment()
splits at gso_size regardless of the MTU, so falling back to software
segmentation would give the device non TSO packets bigger than the
9728 bytes it supports.
Note that the device can still be given oversized non TSO packets when
the stack segments in software for other reasons, for instance after
TSO has been disabled with ethtool. This is a generic issue, because
the MTU check is skipped for GSO packets in the forwarding path, and
is addressed separately.
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-2026-98556 的公开POC
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|---|
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CVE-2026-98556 补丁与修复 (2)
同批安全公告 · Linux · 2026-10-18 · 共 435 条
| CVE-2026-98720 | KVM nVMX 远程代码执行漏洞 | |
| CVE-2026-98733 | Linux 蓝牙 ISO 分组队列序列化漏洞 | |
| CVE-2026-98732 | btintel 缓冲区越界读取漏洞 | |
| CVE-2026-98731 | btintel_pcie 蓝牙驱动 plen 溢出漏洞 | |
| CVE-2026-98730 | 蓝牙 btintel_pcie 驱动拒绝超大 TX 数据包 | |
| CVE-2026-98729 | Linux 内核 x86/mm AMD F15h 大页映射漏洞 | |
| CVE-2026-98728 | TPM 2.0 tpm2_get_random 边界检查漏洞 | |
| CVE-2026-98727 | nvme-multipath 越界访问漏洞 | |
| CVE-2026-98726 | nvme-multipath 任意版本 ANA 日志越界漏洞 | |
| CVE-2026-98725 | nvmet-auth 越界写入漏洞 | |
| CVE-2026-98724 | nvmet-pci-epf 拒绝过短 SGL 段漏洞 | |
| CVE-2026-98723 | Linux nvmet 主机 ID 复制逻辑漏洞 | |
| CVE-2026-98722 | Linux 内核 mtd 块设备模块除零漏洞 | |
| CVE-2026-98721 | Cadence rawnand 驱动程序竞争条件漏洞 | |
| CVE-2026-98709 | mac80211 无线驱动资源预留计数逻辑漏洞 | |
| CVE-2026-98712 | KVM arm64 vgic 整数溢出漏洞 | |
| CVE-2026-98711 | Linux内核 cw1200 驱动 TX 填充越界读取漏洞 | |
| CVE-2026-98710 | Linux 内核 iwlegacy 驱动 3945 释放后使用漏洞 | |
| CVE-2026-98713 | KVM arm64 版本细粒度 UNDEF 处理漏洞 | |
| CVE-2026-98707 | mac80211 无线驱动拒绝服务漏洞 |
显示前 20 条，共 435 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-98556
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