CVE-2026-99255— Linux 内核 io_uring 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： io_uring/io-wq：避免在取消操作时隐藏请求链（link） 当一个任务退出时，它会取消自己跟踪的所有请求，并等待这些请求全部完成或释放。 会遍历请求可能出现的所有位置；如果未找到可取消的请求，该函数会进入睡眠状态。每当该任务的某个请求通过任务工作（task work）完成或被释放时，该函数会被唤醒。 然而，当 io-wq 完成一个带有链接（link）的请求时，存在一个短暂的时间窗口，此时链接中的下一个请求无法被找到： 在这个时间窗口内，该链接请求既不是“待处理
可能的 ATT&CK 技术 2 AI
T1069 · Permission Groups Discovery T1068 · Exploitation for Privilege Escalation影响版本矩阵 14
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 768134d4f48109b90f4248feecbeeb7d684e410c< 98470f164286f7f62aaee519d4d11b9370ce6d7b |
affected |
768134d4f48109b90f4248feecbeeb7d684e410c< d39ebc7a583d650b1d6da9b45e2ce96ad4d877e4 |
affected | ||
768134d4f48109b90f4248feecbeeb7d684e410c< ebe8e97fb99d9f374c482902a00677cfd24a6c27 |
affected | ||
768134d4f48109b90f4248feecbeeb7d684e410c< 3e02b8df0e9fa1423ac2a4e03409a9329c30ac49 |
affected | ||
768134d4f48109b90f4248feecbeeb7d684e410c< 92e20e9c72bdf6cfa6f84eded7b33399bc7061da |
affected | ||
768134d4f48109b90f4248feecbeeb7d684e410c< 436d48a2ed13112d2d27085325838e5bce6b4507 |
affected | ||
5.5 |
affected | ||
< 5.5 |
unaffected | ||
| … +6 条更多 | |||
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一、 漏洞 CVE-2026-99255 基础信息
漏洞信息
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Vulnerability Title
io_uring/io-wq: don't hide a link from cancellations
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
io_uring/io-wq: don't hide a link from cancellations
A task that exits cancels its tracked requests and waits until they are
gone. io_uring_cancel_generic() looks everywhere a request can be, and
goes to sleep if it found nothing to cancel. It is woken up each time
one of the requests of the task is completed by task work or freed.
When io-wq is done with a request that has a link, there is a time in which
the next request of the link can't be found:
io_worker_handle_work()
io_assign_current_work(worker, NULL)
io_wq_free_work(work)
io_req_find_next() // takes the link off the request
io_free_req() // task work for the task
io_assign_current_work(worker, linked)
io_run_task_work()
cond_resched()
worker->cur_work = linked
It is not pending, it is not the current work of a worker, and it is not
yet on the list that it is about to be parked on. If the pass that the
exiting task makes because of io_free_req() falls into that time, it finds
nothing and the task goes to sleep. The worker then runs the link, which
IO_WQ_BIT_EXIT doesn't prevent for bounded work. If that parks the request
nothing is completed or freed, and nobody wakes up the task. If it is the
process that exits it can't be killed any more either.
NOP, IOSQE_ASYNC | IOSQE_IO_LINK
FUTEX_WAIT, FUTEX2_PRIVATE
exit of the thread, or of the process, up to 63us later
With four of these per round 5 to 8 of 10,000 rounds hang (4 CPUs, KVM):
io_uring_cancel_generic
do_exit
Commit f8b632e89a10 ("io_uring: tighten task exit cancellations") is about
the same gap, and makes the task look again for whatever happens before
io_free_req().
Free the request once the link is the current work of the worker, or
pending. Whoever is woken up by that can find the link, until it is parked
where cancellations look as well. To do so split io_wq_free_work() in two.
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-2026-99255 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-99255 其他参考 (6)
同批安全公告 · Linux · 2026-11-03 · 共 28 条
| CVE-2026-99270 | 8.1 HIGH | Linux TCP 潜在释放后重用漏洞 |
| CVE-2026-99246 | 8.1 HIGH | Linux TIPC 节点重置追踪转储竞争条件漏洞 |
| CVE-2026-99269 | 7.8 HIGH | Linux sched_ext 任务调度逻辑缺陷 |
| CVE-2026-99264 | 7.8 HIGH | Linux io_uring 拒绝重试未提交缓冲区的接收 |
| CVE-2026-99243 | io-wq 工作线程创建退出位排序漏洞 | |
| CVE-2026-99245 | Linux 内核 key_reject_and_link 竞态漏洞 | |
| CVE-2026-99244 | Linux pid_namespace 信号中断漏洞 | |
| CVE-2026-99248 | xiic 驱动运行时电源管理时钟警告漏洞 | |
| CVE-2026-99247 | tracing 组件远程代码执行漏洞 | |
| CVE-2026-99249 | Linux 内核 pid_namespace 冻结漏洞 | |
| CVE-2026-99250 | Linux 内核 kthread 启动延迟漏洞 | |
| CVE-2026-99251 | Hyper-V 驱动无限重试循环漏洞 | |
| CVE-2026-99252 | Linux Kernel io_uring 拒绝服务漏洞 | |
| CVE-2026-99253 | Linux 内核 io_uring 竞态条件漏洞 | |
| CVE-2026-99254 | Linux io_uring 拒绝任务取消时任务工作洪泛漏洞 | |
| CVE-2026-99257 | Linux GPIO 共享设备查找处理漏洞 | |
| CVE-2026-99256 | dm cache 后台工作锁机制漏洞 | |
| CVE-2026-99259 | Tegra PMC 时钟速率未初始化漏洞 | |
| CVE-2026-99258 | Linux x86 Hyper-V 内核信息泄露漏洞 | |
| CVE-2026-99260 | NTFS 属性标志转换逻辑漏洞 |
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