CVE-2026-23159— Linux kernel 安全漏洞
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。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于is_user_task辅助函数检查不当，可能导致性能分析器崩溃。
影响版本矩阵 14
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 34b5aba8511a12fb2e9bd3124835cb4087187dac< d84a4836dc246b7dc244e46a08ff992956b68db0 |
affected |
8d79f96e477c4b8e3fca2efb36b269d8960a2285< 5aac392fcd3d981d7997f1a0766829e1afdeac2e |
affected | ||
90942f9fac05702065ff82ed0bade0d08168d4ea< a28fce0365e1cb9cb8c04c893b9334e5ca9d9f1c |
affected | ||
90942f9fac05702065ff82ed0bade0d08168d4ea< 76ed27608f7dd235b727ebbb12163438c2fbb617 |
affected | ||
5050083e1a2f3e5e29cee0205c40e5864b52601d |
affected | ||
6.6.116< 6.6.123 |
affected | ||
6.12.57< 6.12.69 |
affected | ||
6.17.7< 6.18 |
affected | ||
| … +6 条更多 | |||
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一、 漏洞 CVE-2026-23159 基础信息
漏洞信息
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Vulnerability Title
perf: sched: Fix perf crash with new is_user_task() helper
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
perf: sched: Fix perf crash with new is_user_task() helper
In order to do a user space stacktrace the current task needs to be a user
task that has executed in user space. It use to be possible to test if a
task is a user task or not by simply checking the task_struct mm field. If
it was non NULL, it was a user task and if not it was a kernel task.
But things have changed over time, and some kernel tasks now have their
own mm field.
An idea was made to instead test PF_KTHREAD and two functions were used to
wrap this check in case it became more complex to test if a task was a
user task or not[1]. But this was rejected and the C code simply checked
the PF_KTHREAD directly.
It was later found that not all kernel threads set PF_KTHREAD. The io-uring
helpers instead set PF_USER_WORKER and this needed to be added as well.
But checking the flags is still not enough. There's a very small window
when a task exits that it frees its mm field and it is set back to NULL.
If perf were to trigger at this moment, the flags test would say its a
user space task but when perf would read the mm field it would crash with
at NULL pointer dereference.
Now there are flags that can be used to test if a task is exiting, but
they are set in areas that perf may still want to profile the user space
task (to see where it exited). The only real test is to check both the
flags and the mm field.
Instead of making this modification in every location, create a new
is_user_task() helper function that does all the tests needed to know if
it is safe to read the user space memory or not.
[1] https://lore.kernel.org/all/20250425204120.639530125@goodmis.org/
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
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于is_user_task辅助函数检查不当，可能导致性能分析器崩溃。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-23159 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2026-02-14 · 共 108 条
| CVE-2025-71202 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23193 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23172 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23209 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71221 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23178 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23184 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23185 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23171 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23169 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23191 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23192 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23198 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23136 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23148 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23139 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71204 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23161 | 7.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23204 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71201 | 7.1 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 108 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-23159
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