AZL-56800
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-56800.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-56800
- Upstream
- Published
- 2025-02-12T14:15:32Z
- Modified
- 2026-04-01T05:18:58.660954Z
- 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
- CVE-2025-21694 affecting package kernel for versions less than 5.15.180.1-1
- 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 __read_vmcore") 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 cond_resched() to the second loop in _readvmcore to (hopefully) get rid of the softlockups.
- References