CVE-2025-39945— 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cnic_delete_task存在释放后重用问题，可能导致空指针取消引用。
可能的 ATT&CK 技术 1 AI
T1200 · Hardware Additions影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | fdf24086f4752aee5dfb40143c736250df017820< fde6e73189f40ebcf0633aed2b68e731c25f3aa3 |
affected |
fdf24086f4752aee5dfb40143c736250df017820< 7b6a5b0a6b392263c3767fc945b311ea04b34bbd |
affected | ||
fdf24086f4752aee5dfb40143c736250df017820< 0405055930264ea8fd26f4131466fa7652e5e47d |
affected | ||
fdf24086f4752aee5dfb40143c736250df017820< e1fcd4a9c09feac0902a65615e866dbf22616125 |
affected | ||
fdf24086f4752aee5dfb40143c736250df017820< 8eeb2091e72d75df8ceaa2172638d61b4cf8929a |
affected | ||
fdf24086f4752aee5dfb40143c736250df017820< 6e33a7eed587062ca8161ad1f4584882a860d697 |
affected | ||
fdf24086f4752aee5dfb40143c736250df017820< 0627e1481676669cae2df0d85b5ff13e7d24c390 |
affected | ||
fdf24086f4752aee5dfb40143c736250df017820< cfa7d9b1e3a8604afc84e9e51d789c29574fb216 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2025-39945 基础信息
漏洞信息
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Vulnerability Title
cnic: Fix use-after-free bugs in cnic_delete_task
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
cnic: Fix use-after-free bugs in cnic_delete_task
The original code uses cancel_delayed_work() in cnic_cm_stop_bnx2x_hw(),
which does not guarantee that the delayed work item 'delete_task' has
fully completed if it was already running. Additionally, the delayed work
item is cyclic, the flush_workqueue() in cnic_cm_stop_bnx2x_hw() only
blocks and waits for work items that were already queued to the
workqueue prior to its invocation. Any work items submitted after
flush_workqueue() is called are not included in the set of tasks that the
flush operation awaits. This means that after the cyclic work items have
finished executing, a delayed work item may still exist in the workqueue.
This leads to use-after-free scenarios where the cnic_dev is deallocated
by cnic_free_dev(), while delete_task remains active and attempt to
dereference cnic_dev in cnic_delete_task().
A typical race condition is illustrated below:
CPU 0 (cleanup) | CPU 1 (delayed work callback)
cnic_netdev_event() |
cnic_stop_hw() | cnic_delete_task()
cnic_cm_stop_bnx2x_hw() | ...
cancel_delayed_work() | /* the queue_delayed_work()
flush_workqueue() | executes after flush_workqueue()*/
| queue_delayed_work()
cnic_free_dev(dev)//free | cnic_delete_task() //new instance
| dev = cp->dev; //use
Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure
that the cyclic delayed work item is properly canceled and that any
ongoing execution of the work item completes before the cnic_dev is
deallocated. Furthermore, since cancel_delayed_work_sync() uses
__flush_work(work, true) to synchronously wait for any currently
executing instance of the work item to finish, the flush_workqueue()
becomes redundant and should be removed.
This bug was identified through static analysis. To reproduce the issue
and validate the fix, I simulated the cnic PCI device in QEMU and
introduced intentional delays — such as inserting calls to ssleep()
within the cnic_delete_task() function — to increase the likelihood
of triggering the bug.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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cnic_delete_task存在释放后重用问题，可能导致空指针取消引用。
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-2025-39945 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-39945 补丁与修复 (8)
同批安全公告 · Linux · 2025-10-04 · 共 144 条
| CVE-2025-39932 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39946 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39948 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39933 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39943 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-53600 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-53615 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39952 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53589 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53586 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50493 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53598 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53566 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53536 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53560 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53559 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53557 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53537 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53539 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53545 | 7.8 HIGH | Linux kernel 安全漏洞 |
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IV. Related Vulnerabilities
V. Comments for CVE-2025-39945
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