CVE-2026-98841— virt vmgenid 驱动数据设置不当漏洞
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： virt: vmgenid：在注册通知处理程序之前设置 driver_data 探测路径（probe paths）均存在一个问题：在将 赋值给设备之前，就注册了通知处理程序，而该处理程序随后会解引用 。 在设备树（Device Tree）路径中，一旦调用 注册了中断处理程序，通知中断（IRQ）就可能立即触发。例如，在探测阶段，中断可能已经处于挂起状态；这种情况常见于虚拟机监控程序（VMM）从快照恢复客户机时，若快照是在驱动程序完成探测之前生成的（Firecracker
影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | e07606713a908eee8099883c8c830ebe33aaf748< 538fe5efaa9704ad820ba34b4f9df135ca873d79 |
affected |
e07606713a908eee8099883c8c830ebe33aaf748< 7a1e8daeaa466c6aaffa223e1afe9cfeece0dd47 |
affected | ||
e07606713a908eee8099883c8c830ebe33aaf748< 8f42954ad8bf9bdbf574f2c437ad30cb2601f401 |
affected | ||
e07606713a908eee8099883c8c830ebe33aaf748< 9f8139c6145cf17d690d6c414d43b4c0bef632fb |
affected | ||
6.10 |
affected | ||
< 6.10 |
unaffected | ||
6.12.113≤ 6.12.* |
unaffected | ||
6.18.56≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-98841 基础信息
漏洞信息
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Vulnerability Title
virt: vmgenid: set driver_data before registering notification handlers
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
virt: vmgenid: set driver_data before registering notification handlers
Both probe paths register their notification handler before assigning
driver_data, which the handler dereferences.
In the devicetree path, the notification IRQ can fire as soon as
devm_request_irq() registers the handler: the interrupt may already be
pending at probe time, for example when a VMM injects the
generation-changed notification while restoring a guest from a snapshot
that was taken before the driver had probed (Firecracker does exactly
this on snapshot restore). The IRQ is also requested with IRQF_SHARED,
so another device sharing the line can trigger the handler just as
early. The handler then calls vmgenid_notify(), which dereferences the
still-NULL driver_data and panics:
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010
CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.18.38+ #1 PREEMPT(none)
Hardware name: linux,dummy-virt (DT)
pc : vmgenid_notify.isra.0+0x24/0x8c
lr : vmgenid_of_irq_handler+0x14/0x34
Call trace:
vmgenid_notify.isra.0+0x24/0x8c (P)
vmgenid_of_irq_handler+0x14/0x34
__handle_irq_event_percpu+0x44/0x1bc
handle_irq_event+0x4c/0xb4
handle_fasteoi_irq+0xf8/0x1f8
The ACPI path has the same ordering problem: the handler is installed
with acpi_install_notify_handler() before driver_data is assigned.
ACPI notifications are dispatched asynchronously from a workqueue, so
the window is narrow, but a notification arriving between the two calls
hits the same NULL dereference.
Assign driver_data before registering the handlers. The state is fully
initialized at that point, so the handlers are safe to run. Should
registration fail, the probe error path leaves no dangling pointer
behind: the driver core clears driver_data in device_unbind_cleanup().
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-2026-98841 的公开POC
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|---|
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CVE-2026-98841 补丁与修复 (4)
同批安全公告 · Linux · 2026-10-18 · 共 436 条
| CVE-2026-98582 | ST21NFCA NFC 驱动接收帧大小验证漏洞 | |
| CVE-2026-98568 | Linux vxlan 邻居回复内存使用漏洞 | |
| 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-2026-98593 | 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-2026-98591 | 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-2026-98589 | bpf 子程序拒绝 pkt 参数 | |
| CVE-2026-98594 | tg3 驱动 PHYLIB 资源清理漏洞 |
显示前 20 条，共 436 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-98841
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