{"id":"CVE-2026-93239","published":"2026-09-24T16:17:19.690","lastModified":"2026-09-24T16:17:19.690","description":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: mm: Fix the lockless page-table walk in show_pte()\n\nshow_pte() walks page tables locklessly and can run with interrupts\nenabled. A concurrent teardown can free a table page while it is being\nwalked. It can also clear a parent entry after show_pte() checked it; the\nregular pXd_offset() helpers then reread the cleared entry and can derive a\nbogus lower-level pointer and fault again.\n\nUse the lockless offset helpers with the saved parent entries, as\ngup_fast() does, and pass the saved PMD to pte_offset_map().\n\nFor task page tables, arm64 selects MMU_GATHER_RCU_TABLE_FREE. Disable\nlocal interrupts around the walk to hold off RCU-deferred table frees and\nblock the tlb_remove_table_sync_one() IPI until the walk is finished.\n\nPlace the IRQ guard after the header print. This does not make the output a\nconsistent snapshot, but prevents the task page-table walk from\ndereferencing a released table page or deriving a pointer from a different\nparent value.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/08d931a0a850ad16a64f2cd23a19f40795cdbdf7","tags":[]},{"url":"https://git.kernel.org/stable/c/0f05d95b99164a9ccc4cf4a4920e0ff0228138ad","tags":[]},{"url":"https://git.kernel.org/stable/c/68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3","tags":[]},{"url":"https://git.kernel.org/stable/c/a77644d009dece1104b6fcc6e322b0e4503db0d6","tags":[]},{"url":"https://git.kernel.org/stable/c/b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}