CVE-2025-21694
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-21694
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21694.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-21694
- Downstream
- Published
- 2025-02-12T14:15:32Z
- Modified
- 2025-10-01T21:16:40Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
fs/proc: fix softlockup in _readvmcore (part 2)
Since commit 5cbcb62dddf5 ("fs/proc: fix softlockup in _readvmcore") the number of softlockups in _readvmcore 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 _readvmcore 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 condresched() to the second loop in _read_vmcore to (hopefully) get rid of the softlockups.
- 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
- https://git.kernel.org/stable/c/a5a2ee8144c3897d37403a69118c3e3dc5713958
- https://git.kernel.org/stable/c/cbc5dde0a461240046e8a41c43d7c3b76d5db952