In the Linux kernel, the following vulnerability has been resolved:
hung_task: 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 WARN_ON_ONCE 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!
CVSS Details
- CVSS 3.1 Base Score: 8.2
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 16, 2025 |
| Ubuntu | — | Upgrade linux-image-realtime-6.17Upgrade linux-image-gcp-64k-6.17Upgrade linux-image-genericUpgrade linux-image-6.17.0-1007-oracleUpgrade linux-image-generic-64kUpgrade linux-image-azure-6.17Upgrade linux-image-raspi-6.17Upgrade linux-image-6.17.0-1007-oracle-64kUpgrade linux-image-6.17.0-1007-aws-64kUpgrade linux-image-aws-64k-6.17Upgrade linux-image-6.17.0-1007-gcpUpgrade linux-image-virtual-6.17Upgrade linux-image-6.17.0-1011-oemUpgrade linux-image-6.17.0-1006-realtimeUpgrade linux-image-oracle-64kUpgrade linux-image-raspiUpgrade linux-image-oracle-64k-6.17Upgrade linux-image-6.17.0-14-genericUpgrade linux-image-azureUpgrade linux-image-6.17.0-1008-azureUpgrade linux-image-generic-6.17Upgrade linux-image-gcp-64kUpgrade linux-image-generic-64k-6.17Upgrade linux-image-gcpUpgrade linux-image-gcp-6.17Upgrade linux-image-awsUpgrade linux-image-6.17.0-1007-gcp-64kUpgrade linux-image-virtualUpgrade linux-image-6.17.0-14-generic-64kUpgrade linux-image-realtimeUpgrade linux-image-aws-64kUpgrade linux-image-6.17.0-1008-raspiUpgrade linux-image-oem-6.17Upgrade linux-image-6.17.0-1007-awsUpgrade linux-image-oracle-6.17Upgrade linux-image-oracleUpgrade linux-image-aws-6.17 | Feb 13, 2026 | Feb 12, 2026 |
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