MediumFix available
fs/proc: fix softlockup in __read_vmcore (part 2)
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.234, 5.15.177, 5.4.290, 6.1.127, 6.12.11, 6.6.74
- CVEs
- CVE-2025-21694
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 02:55 UTC · Revision 1
Source evidence
fs/proc: fix softlockup in __read_vmcore (part 2)
core-osv · Original sourcePublished 12 Feb 2025, 13:27 UTC
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.
osv:CVE-2025-21694
Kernel
Fixed versions: 5.4.290, 5.10.234, 5.15.177, 6.1.127, 6.6.74, 6.12.11
Complete source record
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