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In the Linux kernel, the following vulnerability has been resolved:
mm: turn folio_test_hugetlb into a PageType
The current folio_test_hugetlb() can be fooled by a concurrent folio split into returning true for a folio which has never belonged to hugetlbfs. This can't happen if the caller holds a refcount on it, but we have a few places (memory-failure, compaction, procfs) which do not and should not take a speculative reference.
Since hugetlb pages do not use individual page mapcounts (they are always fully mapped and use the entire_mapcount field to record the number of mappings), the PageType field is available now that page_mapcount() ignores the value in this field.
In compaction and with CONFIG_DEBUG_VM enabled, the current implementation can result in an oops, as reported by Luis. This happens since 9c5ccf2db04b ("mm: remove HUGETLB_PAGE_DTOR") effectively added some VM_BUG_ON() checks in the PageHuge() testing path.
[[email protected]: update vmcoreinfo]
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 20, 2024 |
| Ubuntu | — | Upgrade linux-image-kvmUpgrade linux-image-lowlatencyUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-6.8.0-1013-awsUpgrade linux-image-nvidia-6.8Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1012-gcpUpgrade linux-image-raspiUpgrade linux-image-6.8.0-1011-nvidiaUpgrade linux-image-6.8.0-40-lowlatency-64kUpgrade linux-image-awsUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1012-azureUpgrade linux-image-ibm-classicUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-40-genericUpgrade linux-image-azureUpgrade linux-image-nvidiaUpgrade linux-image-ibmUpgrade linux-image-6.8.0-40-generic-64kUpgrade linux-image-6.8.0-1011-nvidia-64kUpgrade linux-image-6.8.0-1012-azure-fdeUpgrade linux-image-6.8.0-1011-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1009-raspiUpgrade linux-image-6.8.0-1008-gkeUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-lowlatency-64kUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.8.0-1010-oracleUpgrade linux-image-gcpUpgrade linux-image-oracle-64kUpgrade linux-image-virtualUpgrade linux-image-6.8.0-40-lowlatencyUpgrade linux-image-oem-24.04aUpgrade linux-image-6.8.0-1011-nvidia-lowlatencyUpgrade linux-image-genericUpgrade linux-image-6.8.0-1010-ibmUpgrade linux-image-nvidia-64kUpgrade linux-image-oracleUpgrade linux-image-6.8.0-1010-oracle-64kUpgrade linux-image-oem-24.04Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.8.0-1010-oemUpgrade linux-image-gkeUpgrade linux-image-generic-64kUpgrade linux-image-generic-lpae | Aug 9, 2024 | May 20, 2024 |
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