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CVE-2025-21691— cachestat: fix page cache statistics permission checking

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cachestat系统调用缺少对页面缓存统计权限的正确检查，可能导致未授权访问。

AI Predicted 7.8 Difficulty: Easy EPSS 0.20% · P10

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux cf264e1329fb0307e044f7675849f9f38b44c11a< 7d6405c13b0d8a8367cd8df63f118b619a3f0dd2 affected
cf264e1329fb0307e044f7675849f9f38b44c11a< 780ab8329672464984cf1344bd5c3993af0226c7 affected
cf264e1329fb0307e044f7675849f9f38b44c11a< 97153a05077f618f7471f50a78158602badccb30 affected
cf264e1329fb0307e044f7675849f9f38b44c11a< 5f537664e705b0bf8b7e329861f20128534f6a83 affected
6.5 affected
< 6.5 unaffected
6.6.75≤ 6.6.* unaffected
6.12.12≤ 6.12.* unaffected
… +2 more rows
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I. Basic Information for CVE-2025-21691

Vulnerability Information
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Vulnerability Title
cachestat: fix page cache statistics permission checking
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cachestat: fix page cache statistics permission checking When the 'cachestat()' system call was added in commit cf264e1329fb ("cachestat: implement cachestat syscall"), it was meant to be a much more convenient (and performant) version of mincore() that didn't need mapping things into the user virtual address space in order to work. But it ended up missing the "check for writability or ownership" fix for mincore(), done in commit 134fca9063ad ("mm/mincore.c: make mincore() more conservative"). This just adds equivalent logic to 'cachestat()', modified for the file context (rather than vma).
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cachestat系统调用缺少对页面缓存统计权限的正确检查，可能导致未授权访问。
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 cf264e1329fb0307e044f7675849f9f38b44c11a ~ 7d6405c13b0d8a8367cd8df63f118b619a3f0dd2 -
Linux Linux 6.5 -

II. Public POCs for CVE-2025-21691

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III. Intelligence Information for CVE-2025-21691

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Patches & Fixes for CVE-2025-21691 (4)

Same Patch Batch · Linux · 2025-02-10 · 8 CVEs total

CVE-2025-21687 7.8 HIGH vfio/platform: check the bounds of read/write syscalls
CVE-2025-21692 7.8 HIGH net: sched: fix ets qdisc OOB Indexing
CVE-2025-21693 7.8 HIGH mm: zswap: properly synchronize freeing resources during CPU hotunplug
CVE-2024-57950 drm/amd/display: Initialize denominator defaults to 1
CVE-2025-21689 USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()
CVE-2025-21688 drm/v3d: Assign job pointer to NULL before signaling the fence
CVE-2025-21690 scsi: storvsc: Ratelimit warning logs to prevent VM denial of service

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21691

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