CVE-2026-99093— Linux 内核启动时延迟页表释放调度漏洞
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，以下漏洞已被修复： mm：在系统启动期间，不要安排延迟的内核页表释放操作 当使用启动时函数追踪器（boot-time function tracer）并配合过滤器（例如： ）进行启动时，在 7.3-rc4 版本中，一旦追踪器开始运行，系统就会立即发生内核恐慌（panic）： 问题原因分析： 启动时的追踪器由 函数启动，该函数在 之前执行。当将追踪器的跳板（trampoline）设置为只读时，会触发大页（large page）的分裂（split），而紧接着 CPA（Change Page At
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一、 漏洞 CVE-2026-99093 基础信息
漏洞信息
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Vulnerability Title
mm: don't schedule deferred kernel page table freeing while booting
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mm: don't schedule deferred kernel page table freeing while booting
Booting with a boot-time function tracer and a filter, for example
ftrace=function ftrace_filter=pud_free_pmd_page
panics on 7.3-rc4 as soon as the tracer starts:
[ 23.531178] Starting tracer 'function'
[ 23.675800] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN NOPTI
[ 23.819917] KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7]
[ 23.964025] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 7.3.0-rc4-fe2ec83746e5-with-fixes-v2+ #195 PREEMPT(undef)
[ 24.252248] RIP: 0010:__queue_work+0xab/0xf00
[ 25.981629] Call Trace:
[ 26.125727] <TASK>
[ 26.413912] ? pagetable_free_kernel+0x20/0x120
[ 26.990283] queue_work_on+0x97/0xf0
[ 27.134382] __cpa_collapse_large_pages+0x501/0x6f0
[ 27.566662] cpa_flush+0x394/0x620
[ 27.998953] change_page_attr_set_clr+0x321/0x4a0
[ 29.151729] set_memory_rox+0xa2/0xf0
[ 29.584018] create_trampoline+0x431/0x6f0
...
[ 44.343347] Kernel panic - not syncing: Attempted to kill the idle task!
The boot-time tracer is started from early_trace_init(), which runs
before workqueue_init_early(). Making its trampoline read-only splits a
large page, and CPA collapses it again right away. The split table has
been a kernel page table since commit 9e4a3ec3411b
("x86/mm/pat: Allocate split page tables as kernel page tables"), so the
collapse frees it through pagetable_free_kernel(), which queues work on
system_percpu_wq - still NULL at that point. That commit is correct in
itself; it only lets CPA reach pagetable_free_kernel() before the
workqueue that function relies on exists.
Keep putting the table on the list, but don't schedule the work while
the system is still booting. A core_initcall schedules it once to free
whatever was queued by then.
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-2026-99093 的公开POC
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CVE-2026-99093 补丁与修复 (2)
同批安全公告 · Linux · 2026-10-26 · 共 12 条
| CVE-2026-99099 | x86/CPU/AMD TLBI 错误#1718 修复 | |
| CVE-2026-99097 | TEE 动态共享内存分配零大小拒绝漏洞 | |
| CVE-2026-99098 | dm-integrity 内联模式缓冲区溢出漏洞 | |
| CVE-2026-99095 | V3D drm/vc4 驱动未绑定资源释放漏洞 | |
| CVE-2026-99096 | Linux io_uring 权限绕过漏洞 | |
| CVE-2026-99094 | Linux 蓝牙驱动 btintel_pcie 越界漏洞 | |
| CVE-2026-99092 | RISC-V BPF JIT 执行内存地址处理漏洞 | |
| CVE-2026-99090 | amdgpu GPU 重置期间 vblank 计数器序列化竞争漏洞 | |
| CVE-2026-99091 | 蓝牙 MGMT 电源关闭时命令状态修复漏洞 | |
| CVE-2026-99089 | ASoC 三星 I2S 运行时电源管理不平衡漏洞 | |
| CVE-2026-99088 | Open vSwitch 验证 IPv6 地址传输头漏洞 |