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CVE-2025-21841— cpufreq/amd-pstate: Fix cpufreq_policy ref counting

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amd_pstate_update_limits函数未正确释放cpufreq_policy引用计数。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 45722e777fd99ea863fe653c1838d39f678506e2< 56e6976793c0fcf1638aa534242408ab4e4ca705 affected
45722e777fd99ea863fe653c1838d39f678506e2< 28e4c515cf644c621800bd97841757fd49891ba4 affected
45722e777fd99ea863fe653c1838d39f678506e2< 3ace20038e19f23fe73259513f1f08d4bf1a3c83 affected
6.12 affected
< 6.12 unaffected
6.12.16≤ 6.12.* unaffected
6.13.4≤ 6.13.* unaffected
6.14≤ * unaffected
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I. Basic Information for CVE-2025-21841

Vulnerability Information
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Vulnerability Title
cpufreq/amd-pstate: Fix cpufreq_policy ref counting
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cpufreq/amd-pstate: Fix cpufreq_policy ref counting amd_pstate_update_limits() takes a cpufreq_policy reference but doesn't decrement the refcount in one of the exit paths, fix that.
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amd_pstate_update_limits函数未正确释放cpufreq_policy引用计数。
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 45722e777fd99ea863fe653c1838d39f678506e2 ~ 56e6976793c0fcf1638aa534242408ab4e4ca705 -
Linux Linux 6.12 -

II. Public POCs for CVE-2025-21841

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III. Intelligence Information for CVE-2025-21841

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Patches & Fixes for CVE-2025-21841 (3)

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-2025-21840 thermal/netlink: Prevent userspace segmentation fault by adjusting UAPI header
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-2025-21841

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