In the Linux kernel, the following vulnerability has been resolved:
hugetlb, userfaultfd: fix reservation restore on userfaultfd error
Currently in the is_continue case in hugetlb_mcopy_atomic_pte(), if we bail out using "goto out_release_unlock;" in the cases where idx >= size, or !huge_pte_none(), the code will detect that new_pagecache_page == false, and so call restore_reserve_on_error(). In this case I see restore_reserve_on_error() delete the reservation, and the following call to remove_inode_hugepages() will increment h->resv_hugepages causing a 100% reproducible leak.
We should treat the is_continue case similar to adding a page into the pagecache and set new_pagecache_page to true, to indicate that there is no reservation to restore on the error path, and we need not call restore_reserve_on_error(). Rename new_pagecache_page to page_in_pagecache to make that clear.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | Apr 10, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Apr 10, 2024 |
| Suse | — | Upgrade cluster-md-kmp-azureUpgrade dtb-amazonUpgrade kernel-debug-livepatch-develUpgrade kselftests-kmp-defaultUpgrade kernel-sourceUpgrade kernel-macrosUpgrade kselftests-kmp-rtUpgrade kernel-default-develUpgrade dtb-xilinxUpgrade dlm-kmp-defaultUpgrade kernel-kvmsmall-develUpgrade kernel-64kb-develUpgrade kernel-obs-qaUpgrade dtb-amdUpgrade ocfs2-kmp-rtUpgrade kernel-azure-livepatch-develUpgrade reiserfs-kmp-azureUpgrade dtb-armUpgrade kernel-rt_debug-vdsoUpgrade dtb-qcomUpgrade dtb-hisiliconUpgrade dtb-socionextUpgrade kernel-rt_debugUpgrade kernel-azure-vdsoUpgrade kernel-default-extraUpgrade kernel-rtUpgrade kernel-debug-develUpgrade reiserfs-kmp-rtUpgrade kernel-docsUpgrade kernel-symsUpgrade kernel-rt-livepatch-develUpgrade kernel-64kbUpgrade kernel-zfcpdumpUpgrade cluster-md-kmp-defaultUpgrade dtb-apmUpgrade gfs2-kmp-rtUpgrade kernel-kvmsmallUpgrade kernel-azure-develUpgrade dtb-mediatekUpgrade kernel-syms-azureUpgrade kernel-debugUpgrade kernel-syms-rtUpgrade kernel-devel-azureUpgrade dlm-kmp-azureUpgrade kernel-64kb-optionalUpgrade kernel-rt-develUpgrade kernel-devel-rtUpgrade kernel-64kb-livepatch-develUpgrade gfs2-kmp-64kbUpgrade dtb-amlogicUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-rt-livepatchUpgrade kernel-azure-extraUpgrade ocfs2-kmp-azureUpgrade dtb-sprdUpgrade ocfs2-kmp-defaultUpgrade kernel-kvmsmall-vdsoUpgrade kernel-rt_debug-develUpgrade dtb-rockchipUpgrade kernel-azure-optionalUpgrade kernel-rt-optionalUpgrade dtb-freescaleUpgrade kernel-default-baseUpgrade kselftests-kmp-64kbUpgrade reiserfs-kmp-defaultUpgrade dtb-allwinnerUpgrade dlm-kmp-rtUpgrade kernel-source-rtUpgrade dtb-renesasUpgrade kernel-docs-htmlUpgrade cluster-md-kmp-64kbUpgrade dtb-exynosUpgrade ocfs2-kmp-64kbUpgrade kernel-source-vanillaUpgrade dtb-alteraUpgrade dtb-nvidiaUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-defaultUpgrade kernel-default-livepatchUpgrade kernel-develUpgrade dlm-kmp-64kbUpgrade dtb-marvellUpgrade reiserfs-kmp-64kbUpgrade dtb-caviumUpgrade dtb-lgUpgrade kernel-default-optionalUpgrade kernel-obs-buildUpgrade cluster-md-kmp-rtUpgrade kernel-rt-vdsoUpgrade kernel-azureUpgrade kernel-debug-vdsoUpgrade kernel-default-base-rebuildUpgrade gfs2-kmp-azureUpgrade kselftests-kmp-azureUpgrade kernel-64kb-extraUpgrade dtb-broadcomUpgrade dtb-appleUpgrade kernel-default-livepatch-develUpgrade kernel-rt-extraUpgrade kernel-default-vdsoUpgrade gfs2-kmp-defaultUpgrade kernel-source-azure | Aug 9, 2024 | Apr 10, 2024 |
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