CVE-2026-80916— kcov PREEMPT_RT 数据损坏与竞态条件
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： kcov：修复 PREEMPT_RT 上的数据损坏和竞争条件 syzbot 报告了在 PREEMPT_RT 内核上出现 KCOV 状态损坏的问题。原因是用于保存/恢复远程 KCOV 状态的临时存储空间当前被分配为 per-CPU（每 CPU）区域。 在 PREEMPT_RT 内核中，软中断处理程序（softirq handlers）作为可抢占的任务线程运行（例如 ksoftirqd）。如果一个软中断上下文抢占了一个正在运行远程 KCOV 会话的任务，它会安全地将该任务的状
影响版本矩阵 20
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 5ff3b30ab57da82d8db4f14662a2858cabfbc2c0< ef7048d8a614c5f5a9b20513a5428101a744514e |
affected |
5ff3b30ab57da82d8db4f14662a2858cabfbc2c0< 8ed3ddf23d39bf5338406bd9f8863d44748cf6ce |
affected | ||
5ff3b30ab57da82d8db4f14662a2858cabfbc2c0< 5dc59fc959b2b5742985d7ef24bccd1868217dc2 |
affected | ||
5ff3b30ab57da82d8db4f14662a2858cabfbc2c0< a2fb8222cde23b0001812ed3acb7c0ea36dd94e2 |
affected | ||
5ff3b30ab57da82d8db4f14662a2858cabfbc2c0< 18799e858b407bf355383c9dd6c06477aa437134 |
affected | ||
5ff3b30ab57da82d8db4f14662a2858cabfbc2c0< e11f5b48c82703242a3be7a7ae4b4940b4cb4610 |
affected | ||
5ff3b30ab57da82d8db4f14662a2858cabfbc2c0< 22670d1552fe155822b2abf91f920925f7d067b4 |
affected | ||
5ff3b30ab57da82d8db4f14662a2858cabfbc2c0< f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761 |
affected | ||
| … +12 条更多 | |||
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一、 漏洞 CVE-2026-80916 基础信息
漏洞信息
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Vulnerability Title
kcov: fix data corruption and race conditions on PREEMPT_RT
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
kcov: fix data corruption and race conditions on PREEMPT_RT
syzbot is reporting KCOV state corruption on PREEMPT_RT kernels, for the
temporary storage used for saving/restoring remote KCOV state is currently
allocated as the per-CPU area.
On PREEMPT_RT kernels, softirq handlers run as preemptible task threads
(e.g., ksoftirqd). If a softirq context preempts a task running a remote
KCOV session, it safely saves the task's state into the per-CPU area.
However, if that softirq thread is subsequently preempted by a higher-
priority softirq thread on the same CPU, the second softirq will overwrite
the same per-CPU area, permanently destroying the original task's KCOV
state.
Fix this data corruption by moving the temporary storage from the per-CPU
area to the per-thread area. Since each softirq thread now owns its own
task context, nested softirq preemption no longer causes data overwrites.
Note that while the temporary storage is now on a per-thread basis, the
per-CPU kcov_percpu_data.lock must be retained, for we need to ensure that
kcov_remote_start() and kcov_remote_stop() operate atomically without
racing against asynchronous interrupts that manipulate the current task's
KCOV state.
It is likely that GFP_KERNEL allocation by vmalloc_node() in kcov_init()
has already called panic() before returning NULL, for there will be no
OOM-killable userspace processes when __init function of built-in module
runs. But this patch also fixes crashing the kernel when vmalloc_node()
in kcov_init() returned NULL, for kcov_init() left per-CPU irq_area == NULL
but kcov_remote_start() depends on per-CPU irq_area != NULL, resulting in
(1) doing vmalloc() in kcov_remote_start() despite !in_task() context
(2) out-of-array-bounds access if (1) succeeded but
kcov->remote_size < CONFIG_KCOV_IRQ_AREA_SIZE
(3) always leak memory allocated by (1), eventually killing all
OOM-killable userspace processes
problems.
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-2026-80916 的公开POC
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|---|
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CVE-2026-80916 补丁与修复 (8)
CVE-2026-80916 其他参考 (1)
同批安全公告 · Linux · 2026-09-09 · 共 12 条
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| CVE-2026-80921 | KVM s390 虚拟化软件 远程代码执行漏洞 | |
| CVE-2026-80920 | Linux内核 io_uring 事件通知延迟漏洞 | |
| CVE-2026-80919 | AMD GPU DevCoreDump 死锁 | |
| CVE-2026-80918 | Linux内核HID驱动 整数与指针混淆漏洞 | |
| CVE-2026-80917 | 32位CAM系统PCI主机通用驱动空指针解引用 | |
| CVE-2026-80915 | Linux内核 drm/xe模块数据路径分配漏洞 | |
| CVE-2026-80914 | 蓝牙ISO监听套接字释放后使用漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-80916
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