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CVE-2026-90303: Linux

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CVSS

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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: ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults When CONFIG_DEBUG_USER=y, and cmdline "user_debug=31" is set, a user fault may trigger show_pte() without any lock. If another thread in the same process concurrently calls munmap(), the page table pages may be freed while show_pte() is still traversing them, causing a use-after-free in show_pte(). If CONFIG_ARM_LPAE=y, this may cause a kernel panic if the pages table of PMD are freed when show_pte() is running. Acquire mmap_write_lock() around show_pte() for user faults to fix the contention. For user faults, additionally restrict that show_pte() is called only when the addr is a user-space address (addr < TASK_SIZE). This is because the lock of tsk->mm only protects the virtual memory of user address space, furthermore, dumping the page tables of a kernel-space address for user faults is unnecessary and may have security implications. Keep everything unchanged for kernel faults, because the kernel is already in the "oops" state, acquiring a lock may risk a deadlock.

    Засегнати продукти

    • Linux Linux: 6d021b724481fbb908eb29384898deb9f00dfe70 преди ab14f07952adfe735d86a53518f8cd576dfd5892; 6d021b724481fbb908eb29384898deb9f00dfe70 преди 07e4d5380f2a844ab7a1b440dde350caf561cbb0; 6d021b724481fbb908eb29384898deb9f00dfe70 преди 2a14d7797a49a47bccd1a9327fd69da838dcb0dd; 6d021b724481fbb908eb29384898deb9f00dfe70 преди 63e3c958a602d0896a101a897c2361878c266ca7; 6d021b724481fbb908eb29384898deb9f00dfe70 преди 59bbf86d0ff9373bfa033ca123c1e924f09f1eba; 6d021b724481fbb908eb29384898deb9f00dfe70 преди c71f9a56520b419e55d173052629f2324deb5549; 6d021b724481fbb908eb29384898deb9f00dfe70 преди 720408d98d9fb3c91a12090436734c8c61f04545; 6d021b724481fbb908eb29384898deb9f00dfe70 преди 1039bffd6ae9c75b42b7d148d6c1106134107b66
    • Linux Linux: 4.0; преди 4.0; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.110 до 6.12.*; 6.18.52 до 6.18.*; 7.2.6 до 7.2.*; от 7.3 нататък

    История

    • 17 септември 2026 Публикувано

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    Първоизточници

    CVE-2026-90303: Linux | freedomonline.bg