CVE-2025-21694

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.

CVSS 3.1

5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 15% of CVEs (scores of 2026-10-25)

Published

2025-02-12

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/649b266606bc413407ce315f710c8ce8a88ee30a
• https://git.kernel.org/stable/c/65c367bd9d4f43513c7f837df5753bea9561b836
• https://git.kernel.org/stable/c/80828540dad0757b6337c6561d49c81038f38d87
• https://git.kernel.org/stable/c/80da29deb88a3a907441fc35bb7bac309f31e713
• https://git.kernel.org/stable/c/84c4ed15626574c9ac6c1039ba9c137a77bcc7f2

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