CVE-2025-21694 - CVE House
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Status published Unknown CVE-2025-21694

fs/proc: fix softlockup in __read_vmcore (part 2)

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Affected Software

Linux
Vulnerable Versions:
803d5a33d5ffdc2d86dcc0cfa01655a330612cdb, 70c1835e776c8447c1aca87ddb38cfe764fe756a, e1b160a50c756e0efbea290b9bf5117cb80e8c4b, a373ad833a6bfe4bc6cedcf7e56a99cc6fd9a193, 518fbd644dabb6aedbdd4939c6c9cc1bf651459f, 5cbcb62dddf5346077feb82b7b0c9254222d3445, 7bdf1d550ddfcd9ab797087421f77b7aceddc8a7, e8780e8a0e25dc4c3927f611ec8970d26c0c7369, 5.4.279, 5.10.221, 5.15.162, 6.1.95, 6.6.35, 4.19.317, 6.9.6, 6.10, 0, 5.4.290, 5.10.234, 5.15.177, 6.1.127, 6.6.74, 6.12.11, 6.13

Timeline

Official Publish: February 12th, 2025
Last Modified: May 23rd, 2026
Added to House: July 22nd, 2026

CVSS Vectors

No vector data available

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.