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CVE-2025-40021— tracing: dynevent: Add a missing lockdown check on dynevent

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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，该漏洞源于缺少动态事件接口的锁定检查，可能导致安全限制绕过。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 2 AI

T1043 T1055 · Process Injection

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5< f3ac1f4eaba58e57943efa3e8b8d71fa7aab0abf affected
17911ff38aa58d3c95c07589dbf5d3564c4cf3c5< 0d41604d2d53c1abe27fefb54b37a8f6642a4d74 affected
17911ff38aa58d3c95c07589dbf5d3564c4cf3c5< 07b1f63b5f86765793fab44d3d4c2be681cddafb affected
17911ff38aa58d3c95c07589dbf5d3564c4cf3c5< 3887f3814c0e770e6b73567fe0f83a2c01a6470c affected
17911ff38aa58d3c95c07589dbf5d3564c4cf3c5< 573b1e39edfcb7b4eecde0f1664455a1f4462eee affected
17911ff38aa58d3c95c07589dbf5d3564c4cf3c5< b47c4e06687a5a7b6c6ef4bd303fcfe4430b26bb affected
17911ff38aa58d3c95c07589dbf5d3564c4cf3c5< 456c32e3c4316654f95f9d49c12cbecfb77d5660 affected
5.4 affected
… +8 more rows
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I. Basic Information for CVE-2025-40021

Vulnerability Information
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Vulnerability Title
tracing: dynevent: Add a missing lockdown check on dynevent
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tracing: dynevent: Add a missing lockdown check on dynevent Since dynamic_events interface on tracefs is compatible with kprobe_events and uprobe_events, it should also check the lockdown status and reject if it is set.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
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，该漏洞源于缺少动态事件接口的锁定检查，可能导致安全限制绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5 ~ f3ac1f4eaba58e57943efa3e8b8d71fa7aab0abf -
Linux Linux 5.4 -

II. Public POCs for CVE-2025-40021

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2025-40021

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Same Patch Batch · Linux · 2025-10-24 · 8 CVEs total

CVE-2023-53733 7.8 HIGH net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode
CVE-2025-40018 7.8 HIGH ipvs: Defer ip_vs_ftp unregister during netns cleanup
CVE-2025-40024 7.8 HIGH vhost: Take a reference on the task in struct vhost_task.
CVE-2025-40019 crypto: essiv - Check ssize for decryption and in-place encryption
CVE-2025-40020 can: peak_usb: fix shift-out-of-bounds issue
CVE-2025-40022 crypto: af_alg - Fix incorrect boolean values in af_alg_ctx
CVE-2025-40023 drm/xe/vf: Don't expose sysfs attributes not applicable for VFs

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40021

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