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5.5 Medium

CVE-2025-21694 In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix softlockup in __read_vmcore (part 2)…

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.

Affected products and versions

Product Affected versions Fixed in
Linux 6.13 earliest → < 6.13 6.13
Linux 6.12 earliest → < 6.12.11 6.12.11
Linux 6.10 No fix stated
Linux 6.6 earliest → < 6.6.74 6.6.74
Linux 6.1 earliest → < 6.1.127 6.1.127
Linux 5.15 earliest → < 5.15.177 5.15.177
Linux 5.10 earliest → < 5.10.234 5.10.234
Linux 5.4 earliest → < 5.4.290 5.4.290
RUGGEDCOM RST2428P 3.2 earliest → < 3.2 3.2
Show the 6 other branches
Product Affected versions Fixed in
SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family 3.2 earliest → < 3.2 3.2
SCALANCE XCM-/XRM-/XCH-/XRH-300 family 3.2 earliest → < 3.2 3.2
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Versions not published
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1 3.1.0 → < 3.1.5 3.1.5
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1 3.1.0 → < 3.1.5 3.1.5
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1 3.1.0 → < 3.1.5 3.1.5

References

Timeline

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