💣Exploit CVE-2024-35993 - In the Linux kernel, the following vulnerability h

[Maksim]

CVE ID : CVE-2024-35993
Published : May 20, 2024, 10:15 a.m. | 40 minutes ago
Description : 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] Link: https://lkml.kernel.org/r/[email protected]
Severity: 0.0 | NA
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