CVE-2025-68250: hung_task: fix warnings caused by unaligned lock pointers
In the Linux kernel, the following vulnerability has been resolved:
hungtask: fix warnings caused by unaligned lock pointers
The blocker tracking mechanism assumes that lock pointers are at least 4-byte aligned to use their lower bits for type encoding.
However, as reported by Eero Tamminen, some architectures like m68k only guarantee 2-byte alignment of 32-bit values. This breaks the assumption and causes two related WARNONONCE checks to trigger.
To fix this, the runtime checks are adjusted to silently ignore any lock that is not 4-byte aligned, effectively disabling the feature in such cases and avoiding the related warnings.
Thanks to Geert Uytterhoeven for bisecting!
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-68250?
CVE-2025-68250 is categorized with a low severity level due to its specific conditions affecting lock pointer alignment.
How do I fix CVE-2025-68250?
To resolve CVE-2025-68250, update your Linux kernel to the latest stable version that includes the patch addressing this issue.
What are the implications of CVE-2025-68250?
CVE-2025-68250 can lead to system warnings but does not pose a direct security threat under normal operation conditions.
Which versions of the Linux kernel are affected by CVE-2025-68250?
CVE-2025-68250 affects various versions of the Linux kernel prior to the fix being applied in the latest updates.
Is CVE-2025-68250 a critical vulnerability?
CVE-2025-68250 is not considered a critical vulnerability and primarily affects system logging rather than security integrity.