CVE-2025-21694
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.
How to fix
- linux linux_kernel4.20, 5.4.290, 5.10.234, 5.15.177, 6.1.127, 6.6.74, 6.12.11 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.19.317 ≤ v < 4.20, 5.4.279 ≤ v < 5.4.290, 5.10.221 ≤ v < 5.10.234, 5.15.162 ≤ v < 5.15.177, 6.1.95 ≤ v < 6.1.127, 6.6.35 ≤ v < 6.6.74, 6.9.6 ≤ v < 6.12.11, 6.13 | 4.20, 5.4.290, 5.10.234, 5.15.177, 6.1.127, 6.6.74, 6.12.11 |
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