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In the Linux kernel, the following vulnerability has been resolved:
s390/mm: Fix VM_FAULT_HWPOISON handling in do_exception()
There is no support for HWPOISON, MEMORY_FAILURE, or ARCH_HAS_COPY_MC on s390. Therefore we do not expect to see VM_FAULT_HWPOISON in do_exception().
However, since commit af19487f00f3 ("mm: make PTE_MARKER_SWAPIN_ERROR more general"), it is possible to see VM_FAULT_HWPOISON in combination with PTE_MARKER_POISONED, even on architectures that do not support HWPOISON otherwise. In this case, we will end up on the BUG() in do_exception().
Fix this by treating VM_FAULT_HWPOISON the same as VM_FAULT_SIGBUS, similar to x86 when MEMORY_FAILURE is not configured. Also print unexpected fault flags, for easier debugging.
Note that VM_FAULT_HWPOISON_LARGE is not expected, because s390 cannot support swap entries on other levels than PTE level.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jul 29, 2024 |
| Ubuntu | — | Upgrade linux-image-nvidia-64k-6.8Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-1017-nvidia-lowlatency-64kUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-6.8.0-1016-gcpUpgrade linux-image-virtualUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-48-generic-64kUpgrade linux-image-6.8.0-1013-gkeUpgrade linux-image-6.8.0-48-genericUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-awsUpgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-6.8.0-1017-azure-fdeUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-6.8.0-1017-nvidia-64kUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.8.0-1017-azureUpgrade linux-image-6.8.0-1015-oracleUpgrade linux-image-kvmUpgrade linux-image-6.8.0-1016-oemUpgrade linux-image-6.8.0-1014-raspiUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-6.8.0-1017-nvidia-lowlatencyUpgrade linux-image-6.8.0-1002-gkeopUpgrade linux-image-gkeUpgrade linux-image-6.8.0-1018-awsUpgrade linux-image-oracleUpgrade linux-image-lowlatency-64kUpgrade linux-image-oem-22.04bUpgrade linux-image-nvidia-6.8Upgrade linux-image-azure-fdeUpgrade linux-image-gkeop-6.8Upgrade linux-image-6.8.0-1016-azure-fdeUpgrade linux-image-6.8.0-1014-ibmUpgrade linux-image-lowlatencyUpgrade linux-image-oracle-64kUpgrade linux-image-oem-22.04Upgrade linux-image-oem-24.04aUpgrade linux-image-azureUpgrade linux-image-gkeopUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-generic-64kUpgrade linux-image-raspiUpgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-genericUpgrade linux-image-nvidiaUpgrade linux-image-gcpUpgrade linux-image-oem-22.04dUpgrade linux-image-6.8.0-48-lowlatency-64kUpgrade linux-image-6.8.0-1017-nvidiaUpgrade linux-image-oem-24.04Upgrade linux-image-6.8.0-48-lowlatencyUpgrade linux-image-6.8.0-1016-azureUpgrade linux-image-6.8.0-1015-oracle-64kUpgrade linux-image-6.8.0-1017-gcpUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-nvidia-64kUpgrade linux-image-oem-22.04cUpgrade linux-image-ibmUpgrade linux-image-oem-22.04aUpgrade linux-image-ibm-classicUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-generic-hwe-22.04 | Nov 4, 2024 | Jul 29, 2024 |
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