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CVE-2025-21840— thermal/netlink: Prevent userspace segmentation fault by adjusting UAPI header

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UAPI头未调整导致用户空间段错误。

AI Predicted 3.3 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1205.003

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 1773572863c43a14a3e45f0591f28b7dec1ee52a< 3a4ca365c51729143a2cab693cd40fe0bb585ef0 affected
1773572863c43a14a3e45f0591f28b7dec1ee52a< c195b9c6ab9c383d7aa3f4a65879b3ca90cb378b affected
6.13 affected
< 6.13 unaffected
6.13.4≤ 6.13.* unaffected
6.14≤ * unaffected
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I. Basic Information for CVE-2025-21840

Vulnerability Information
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Vulnerability Title
thermal/netlink: Prevent userspace segmentation fault by adjusting UAPI header
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: thermal/netlink: Prevent userspace segmentation fault by adjusting UAPI header The intel-lpmd tool [1], which uses the THERMAL_GENL_ATTR_CPU_CAPABILITY attribute to receive HFI events from kernel space, encounters a segmentation fault after commit 1773572863c4 ("thermal: netlink: Add the commands and the events for the thresholds"). The issue arises because the THERMAL_GENL_ATTR_CPU_CAPABILITY raw value was changed while intel_lpmd still uses the old value. Although intel_lpmd can be updated to check the THERMAL_GENL_VERSION and use the appropriate THERMAL_GENL_ATTR_CPU_CAPABILITY value, the commit itself is questionable. The commit introduced a new element in the middle of enum thermal_genl_attr, which affects many existing attributes and introduces potential risks and unnecessary maintenance burdens for userspace thermal netlink event users. Solve the issue by moving the newly introduced THERMAL_GENL_ATTR_TZ_PREV_TEMP attribute to the end of the enum thermal_genl_attr. This ensures that all existing thermal generic netlink attributes remain unaffected. [ rjw: Subject edits ]
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UAPI头未调整导致用户空间段错误。
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 1773572863c43a14a3e45f0591f28b7dec1ee52a ~ 3a4ca365c51729143a2cab693cd40fe0bb585ef0 -
Linux Linux 6.13 -

II. Public POCs for CVE-2025-21840

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III. Intelligence Information for CVE-2025-21840

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Patches & Fixes for CVE-2025-21840 (2)

Same Patch Batch · Linux · 2025-03-07 · 8 CVEs total

CVE-2025-21836 7.8 HIGH io_uring/kbuf: reallocate buf lists on upgrade
CVE-2025-21842 7.8 HIGH amdkfd: properly free gang_ctx_bo when failed to init user queue
CVE-2025-21839 7.3 HIGH KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop
CVE-2025-21835 usb: gadget: f_midi: fix MIDI Streaming descriptor lengths
CVE-2025-21838 usb: gadget: core: flush gadget workqueue after device removal
CVE-2025-21841 cpufreq/amd-pstate: Fix cpufreq_policy ref counting
CVE-2025-21843 drm/panthor: avoid garbage value in panthor_ioctl_dev_query()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21840

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