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CVE-2025-21694— fs/proc: fix softlockup in __read_vmcore (part 2)

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，该漏洞源于在__read_vmcore函数中未正确处理软锁。攻击者利用该漏洞可以导致系统崩溃。

AI Predicted 4.3 Difficulty: Trivial EPSS 0.24% · P15

Affected Version Matrix 25

VendorProduct Version RangeStatus
Linux Linux 803d5a33d5ffdc2d86dcc0cfa01655a330612cdb< 84c4ed15626574c9ac6c1039ba9c137a77bcc7f2 affected
70c1835e776c8447c1aca87ddb38cfe764fe756a< 80da29deb88a3a907441fc35bb7bac309f31e713 affected
e1b160a50c756e0efbea290b9bf5117cb80e8c4b< 649b266606bc413407ce315f710c8ce8a88ee30a affected
a373ad833a6bfe4bc6cedcf7e56a99cc6fd9a193< 65c367bd9d4f43513c7f837df5753bea9561b836 affected
518fbd644dabb6aedbdd4939c6c9cc1bf651459f< a5a2ee8144c3897d37403a69118c3e3dc5713958 affected
5cbcb62dddf5346077feb82b7b0c9254222d3445< 80828540dad0757b6337c6561d49c81038f38d87 affected
5cbcb62dddf5346077feb82b7b0c9254222d3445< cbc5dde0a461240046e8a41c43d7c3b76d5db952 affected
7bdf1d550ddfcd9ab797087421f77b7aceddc8a7 affected
… +17 more rows
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I. Basic Information for CVE-2025-21694

Vulnerability Information
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Vulnerability Title
fs/proc: fix softlockup in __read_vmcore (part 2)
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix softlockup in __read_vmcore (part 2) Since commit 5cbcb62dddf5 ("fs/proc: fix softlockup in __read_vmcore") the number of softlockups in __read_vmcore at kdump time have gone down, but they still happen sometimes. In a memory constrained environment like the kdump image, a softlockup is not just a harmless message, but it can interfere with things like RCU freeing memory, causing the crashdump to get stuck. The second loop in __read_vmcore has a lot more opportunities for natural sleep points, like scheduling out while waiting for a data write to happen, but apparently that is not always enough. Add a cond_resched() to the second loop in __read_vmcore to (hopefully) get rid of the softlockups.
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，该漏洞源于在__read_vmcore函数中未正确处理软锁。攻击者利用该漏洞可以导致系统崩溃。
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 803d5a33d5ffdc2d86dcc0cfa01655a330612cdb ~ 84c4ed15626574c9ac6c1039ba9c137a77bcc7f2 -
Linux Linux 6.10 -

II. Public POCs for CVE-2025-21694

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III. Intelligence Information for CVE-2025-21694

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Patches & Fixes for CVE-2025-21694 (7)

Same Patch Batch · Linux · 2025-02-12 · 7 CVEs total

CVE-2025-21697 7.8 HIGH drm/v3d: Ensure job pointer is set to NULL after job completion
CVE-2025-21699 7.8 HIGH gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag
CVE-2024-57952 7.1 HIGH Revert "libfs: fix infinite directory reads for offset dir"
CVE-2024-57951 hrtimers: Handle CPU state correctly on hotplug
CVE-2025-21695 platform/x86: dell-uart-backlight: fix serdev race
CVE-2025-21696 mm: clear uffd-wp PTE/PMD state on mremap()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21694

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