CVE - CVE-2025-21694

CVE-ID
CVE-2025-21694	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/649b266606bc413407ce315f710c8ce8a88ee30a URL:https://git.kernel.org/stable/c/649b266606bc413407ce315f710c8ce8a88ee30a MISC:https://git.kernel.org/stable/c/65c367bd9d4f43513c7f837df5753bea9561b836 URL:https://git.kernel.org/stable/c/65c367bd9d4f43513c7f837df5753bea9561b836 MISC:https://git.kernel.org/stable/c/80828540dad0757b6337c6561d49c81038f38d87 URL:https://git.kernel.org/stable/c/80828540dad0757b6337c6561d49c81038f38d87 MISC:https://git.kernel.org/stable/c/80da29deb88a3a907441fc35bb7bac309f31e713 URL:https://git.kernel.org/stable/c/80da29deb88a3a907441fc35bb7bac309f31e713 MISC:https://git.kernel.org/stable/c/84c4ed15626574c9ac6c1039ba9c137a77bcc7f2 URL:https://git.kernel.org/stable/c/84c4ed15626574c9ac6c1039ba9c137a77bcc7f2 MISC:https://git.kernel.org/stable/c/a5a2ee8144c3897d37403a69118c3e3dc5713958 URL:https://git.kernel.org/stable/c/a5a2ee8144c3897d37403a69118c3e3dc5713958 MISC:https://git.kernel.org/stable/c/cbc5dde0a461240046e8a41c43d7c3b76d5db952 URL:https://git.kernel.org/stable/c/cbc5dde0a461240046e8a41c43d7c3b76d5db952
Assigning CNA
kernel.org
Date Record Created
20241229	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241229)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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