CVE-2026-98464— Linux RISC-V KVM 定时器回调竞态条件漏洞
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： RISC-V: KVM: 在销毁过程中同步 hrtimer 回调 在非 Sstic 模式下，hrtimer 回调函数会在其最后使用所属 vCPU 之前将 标志清除。如果在回调仍在运行时，销毁流程观察到 为 false，那么 将跳过 调用，导致 可能在回调进入 之前就释放了该 vCPU。 客户机（Guest）可以通过 SBI TIME 指令设置定时器，并通过 SBI 传统关机指令或 SRST 请求关机。任何支持 并在退出时销毁虚拟机（VM）的虚拟机监控程序（VMM）都会提
影响版本矩阵 14
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22< 9bdbae64ae0dab93041ebc57ec4e93def793fc2d |
affected |
3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22< 2af03b606aadaaeb386658ef798c79bdcdef87c1 |
affected | ||
3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22< e66aced74f0122380603c9910a71d77618b28f0e |
affected | ||
3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22< ea91f05a55b807ead3166546a2c75f4185ca645f |
affected | ||
3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22< 3cc6184bd5920c9685d87f4e260568feba08650d |
affected | ||
3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22< aaad136d56d91252517272b68cd533e5714698d5 |
affected | ||
5.16 |
affected | ||
< 5.16 |
unaffected | ||
| … +6 条更多 | |||
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一、 漏洞 CVE-2026-98464 基础信息
漏洞信息
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Vulnerability Title
RISC-V: KVM: Synchronize hrtimer callback during teardown
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
RISC-V: KVM: Synchronize hrtimer callback during teardown
The non-Sstc hrtimer callback clears next_set before its final uses of
the enclosing vCPU. If teardown observes next_set as false while the
callback is still running, kvm_riscv_vcpu_timer_cancel() skips
hrtimer_cancel() and kvm_destroy_vcpus() can free the vCPU before the
callback enters kvm_riscv_vcpu_set_interrupt().
A guest can arm the timer with SBI TIME and request shutdown with SBI
legacy shutdown or SRST. A VMM that honors KVM_EXIT_SYSTEM_EVENT and
destroys the VM supplies the teardown side of the race; no post-launch
host ioctl is needed to arm or request teardown.
On upstream master 62cc90241548, generic KASAN reported:
BUG: KASAN: slab-use-after-free in do_raw_spin_lock
Write of size 4 at addr ff60000005e58898
kvm_riscv_vcpu_set_interrupt
kvm_riscv_vcpu_hrtimer_expired
__hrtimer_run_queues
hrtimer_interrupt
The object was allocated by KVM_CREATE_VCPU and freed concurrently by:
kvm_destroy_vcpus
kvm_arch_destroy_vm
kvm_destroy_vm
__fput
For deterministic validation, I added mdelay(1000) immediately after
the existing next_set = false assignment. This only widens the
existing post-clear callback window. A no-delay trace build naturally
reached the callback-after-teardown-start/before-deinit ordering in 12
of 200 runs, but 1,500 stock-kernel stress iterations did not produce a
KASAN report, so natural reproduction is timing-sensitive.
Always invoke hrtimer_cancel() for an initialized timer. Preserve the
existing -EINVAL result when the timer is no longer set, but only after
synchronizing with a running callback.
With this patch, hrtimer_cancel() blocked for the full widened callback
window before vCPU destruction. KASAN reported no error in 100
fixed-and-widened runs or 200 fix-only timing-sweep runs.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/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-2026-98464 的公开POC
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CVE-2026-98464 补丁与修复 (5)
同批安全公告 · Linux · 2026-10-18 · 共 435 条
| CVE-2026-98490 | 9.8 CRITICAL | Open vSwitch conntrack 模块 辅助函数释放后使用漏洞 |
| CVE-2026-98548 | 9.8 CRITICAL | Linux SCTP 协议 旧 Cookie 错误 数据包丢弃漏洞 |
| CVE-2026-98549 | 9.1 CRITICAL | Linux TCP 重传队列边界合并漏洞 |
| CVE-2026-98451 | 8.8 HIGH | Samba SMB 客户端非普通文件句柄处理漏洞 |
| CVE-2026-98466 | 8.2 HIGH | KVM arm64 版本 hyp 栈页面越界访问漏洞 |
| CVE-2026-98499 | 8.1 HIGH | HID wacom 驱动越界读取漏洞 |
| CVE-2026-98454 | 8.1 HIGH | SMB 客户端创建上下文越界读取漏洞 |
| CVE-2026-98532 | 8.1 HIGH | Linux IPv6 协议栈越界读取漏洞 |
| CVE-2026-98507 | 7.8 HIGH | Linux 内核匿名 VMA 初始化竞态条件漏洞 |
| CVE-2026-98487 | 7.8 HIGH | Linux 网桥 MDB 远程拒绝服务漏洞 |
| CVE-2026-98520 | 7.8 HIGH | Linux 内核 drm/amdkfd 释放后使用漏洞 |
| CVE-2026-98517 | 7.8 HIGH | Linux 内核 nouveau 驱动 UAF 漏洞 |
| CVE-2026-98515 | 7.8 HIGH | Nouveau 驱动双重释放漏洞 |
| CVE-2026-98491 | 7.8 HIGH | Open vSwitch 连接跟踪数据项修改漏洞 |
| CVE-2026-98436 | 7.8 HIGH | AMD XDNA 设备缓冲区导出禁用漏洞 |
| CVE-2026-98510 | 7.8 HIGH | Intel Xe DRM 竞态条件漏洞 |
| CVE-2026-98524 | 7.8 HIGH | RDS IB 映射 MR 失败时 SG 列表未清零漏洞 |
| CVE-2026-98443 | 7.8 HIGH | XFS 修复恢复 iunlink 桶时的游标和指针处理漏洞 |
| CVE-2026-98442 | 7.8 HIGH | Linux 内核 act_ct 扩展重分配导致 UAF 漏洞 |
| CVE-2026-98441 | 7.8 HIGH | Linux Kernel 网络调度器竞态条件漏洞 |
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