Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:x86/mm: Fix flush_tlb_range() when used for zapping normal PMDsOn the following path, flush_tlb_range() can be used for zapping normalPMD entries (PMD entries that point to page tables) together with the PTEentries in the pointed-to page table: collapse_pte_mapped_thp pmdp_collapse_flush flush_tlb_rangeThe arm64 version of flush_tlb_range() has a comment describing that it canbe used for page table removal, and does not use any last-levelinvalidation optimizations. Fix the X86 version by making it behave thesame way.Currently, X86 only uses this information for the following two purposes,which I think means the issue doesn't have much impact: - In native_flush_tlb_multi() for checking if lazy TLB CPUs need to be IPI'd to avoid issues with speculative page table walks. - In Hyper-V TLB paravirtualization, again for lazy TLB stuff.The patch "x86/mm: only invalidate final translations with INVLPGB" whichis currently under review (see
No PoCs from references.
- https://github.com/w4zu/Debian_security