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CVE-2026-74524: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: riscv: mm: Fix out-of-bounds page-table walk during memory hot-remove remove_pud_mapping() and remove_p4d_mapping() obtain a child table base with pud_offset(p4dp, 0) and p4d_offset(pgd, 0), then add the index for addr. RISC-V folds page-table levels at runtime. When a level is folded, its offset helper returns the parent entry itself, but the index can still be nonzero. Adding it walks past the parent table. Sv48 folds P4D, while Sv39 folds both P4D and PUD, so memory hot-remove can descend into unrelated memory and pass an invalid page to __free_pages(). This can trigger: kernel BUG at include/linux/mm.h:1810! VM_BUG_ON_PAGE(page_ref_count(page) == 0) arch_remove_memory+0x1e/0x5c try_remove_memory+0x15e/0x200 remove_memory+0x24/0x3c Only add the index when the corresponding page-table level is enabled, matching p4d_offset() and pud_offset().

    Засегнати продукти

    • Linux Linux: c75a74f4ba19c904c0ae1e011ae2568449409ae4 преди 1da6d832eda02d908df11a30ba6a856b98a3dd76; c75a74f4ba19c904c0ae1e011ae2568449409ae4 преди 54e07a158f7aea2754849d3a5a4cba1ac338ae7e; c75a74f4ba19c904c0ae1e011ae2568449409ae4 преди 1bb0ef8069ef158d245bac91ac178bb4f1a7ccd2; c75a74f4ba19c904c0ae1e011ae2568449409ae4 преди a0188cc133696627857d16054e43f9ebc7efc821
    • Linux Linux: 6.11; преди 6.11; 6.12.103 до 6.12.*; 6.18.44 до 6.18.*; 7.1.8 до 7.1.*; от 7.2 нататък

    История

    • 15 август 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-74524: Linux | freedomonline.bg