CVE-2026-98942— Linux 内核 sched_ext 远程代码执行漏洞
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： sched_ext：在私有上下文中构建 cid 表，并通过 RCU 机制发布 cid 表在修改过程中对 cid kfuncs（内核函数）可见：首次启用时，全局指针在填充完成前就已发布； 会就地重写这些指针；重新启用时则会就地重建。此时，若存在竞态的 TRACING 或 SYSCALL 程序，可能会读取到未填充的条目，包括 kmalloc 分配的表中未初始化的内存，或出现拓扑更新撕裂（torn topo updates）的问题。 修复方案将 cid 表的生命周期绑定到根调
可能的 ATT&CK 技术 1 AI
T1069.006
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一、 漏洞 CVE-2026-98942 基础信息
漏洞信息
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Vulnerability Title
sched_ext: Build the cid tables privately and publish them with RCU
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
sched_ext: Build the cid tables privately and publish them with RCU
The cid tables are visible to the cid kfuncs while being modified: the
first enable publishes the global pointers before filling them,
ops.init_cids() overrides rewrite them in place, and re-enables rebuild
them in place. A racing TRACING or SYSCALL program can read unfilled
entries, including uninitialized memory in the kmalloc'd tables, or torn
topo updates.
Tie the tables' lifetimes to the root sched instead: each root enable
builds a fresh set privately and publishes the per-table __rcu globals once
the layout is final, and root disable unpublishes and RCU-frees the set. A
non-NULL global is now always a fully built table which stays valid for the
reader's RCU read section, and lookups stay two loads. Kfuncs treat NULL as
no-mapping, also after the scheduler exits instead of reporting the stale
last mapping.
The cid kfuncs are available whether the root scheduler is cid-form or
cpu-form, the latter to allow gradual migration to cids. Every root
therefore builds and publishes a default mapping.
Every reader must either be gated on scheduler liveness or NULL-check
inside an RCU read section. Fix the two kfuncs that were neither:
scx_bpf_this_cid() read the table with no RCU or preemption protection and
scx_bpf_task_cid() relied on KF_RCU, which doesn't put a sleepable program
in an RCU read section. The hotplug callbacks are instead serialized by
retiring the tables inside the cpus_read_lock() section that clears
scx_root.
v2: Document why every root builds the tables (desc + cid.c comment).
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-2026-98942 的公开POC
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CVE-2026-98942 其他参考 (2)
同批安全公告 · Linux · 2026-10-23 · 共 218 条
| CVE-2026-98937 | Linux 内核 perf 远程代码执行漏洞 | |
| CVE-2026-98951 | Linux RISC-V 内核 ptrace 缓冲区未初始化漏洞 | |
| CVE-2026-98950 | Linux kernel flow_dissector 整数截断漏洞 | |
| CVE-2026-98949 | Imagination DRM 驱动 remap() 函数引用及 vm_bo 处理漏洞 | |
| CVE-2026-98948 | Mellanox mlxsw 端口范围寄存器泄漏漏洞 | |
| CVE-2026-98947 | vsock 内存泄漏漏洞 | |
| CVE-2026-98946 | V3D 驱动运行时挂起中断禁用漏洞 | |
| CVE-2026-98945 | Steam HID 驱动解绑顺序漏洞 | |
| CVE-2026-98944 | Steam HID 注册重构漏洞 | |
| CVE-2026-98943 | Steam HID 驱动锁清理 | |
| CVE-2026-98941 | ext4 加密 inode 大页启用逻辑漏洞 | |
| CVE-2026-98940 | Linux 内核 ASoC 组件越界读取漏洞 | |
| CVE-2026-98939 | Linux x86/mm 内存管理逻辑缺陷 | |
| CVE-2026-98938 | Rust IRQ 请求机制参数传递漏洞 | |
| CVE-2026-98926 | AMD Display 驱动 DPMS 电源管理漏洞 | |
| CVE-2026-98929 | macsec 在注册前初始化 SecY 的竞态条件漏洞 | |
| CVE-2026-98928 | KVM arm64 信息泄露漏洞 | |
| CVE-2026-98927 | KVM arm64 嵌套 MMU 数组生命周期漏洞 | |
| CVE-2026-98930 | KVM s390 中断注入漏洞 | |
| CVE-2026-98925 | Linux bpf sockmap 序列号重复计数漏洞 |
显示前 20 条，共 218 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-98942
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