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CVE-2026-74729: 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: soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read put_fifo_with_discard() acts as both producer and consumer on the kfifo: it calls kfifo_skip() (advances out) and kfifo_put() (advances in) from the IRQ handler without synchronizing with snoop_file_read(), which also consumes via kfifo_to_user(). On SMP systems this concurrent access can leave (in - out) larger than the ring buffer, so __kfifo_to_user()'s clamp to (in - out) is ineffective and kfifo_copy_to_user() can attempt a copy_to_user() past the kmalloc-2k backing store: usercopy: Kernel memory exposure attempt detected from SLUB object 'kmalloc-2k' (offset 0, size 2049)! kernel BUG at mm/usercopy.c! Call trace: usercopy_abort __check_heap_object __check_object_size kfifo_copy_to_user __kfifo_to_user snoop_file_read vfs_read Serialize kfifo access with a per-channel spinlock shared between the IRQ handler (producer) and the file reader (consumer). Annotate @fifo with __guarded_by(&lock) and opt the driver into context analysis so the compiler enforces that all fifo access holds the lock.

    Засегнати продукти

    • Linux Linux: 3772e5da445420543b25825ac2b5971f3743f6e8 преди f62afe827c52c300c64715631e6ac9e576c5112d; 3772e5da445420543b25825ac2b5971f3743f6e8 преди b87c0d24386ed5106feac12034fe09d893ccb469; 3772e5da445420543b25825ac2b5971f3743f6e8 преди afe2527eae0b51d5e8ddd77293afab3a5a1311a4; 3772e5da445420543b25825ac2b5971f3743f6e8 преди 868c478abce858135db3eb65548a577e4b6747ac; 3772e5da445420543b25825ac2b5971f3743f6e8 преди 131ab677b03349a5ae48da8722ec7075b37ec66e; 3772e5da445420543b25825ac2b5971f3743f6e8 преди 1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f
    • Linux Linux: 4.19; преди 4.19; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.114 до 6.12.*; 6.18.57 до 6.18.*; 7.1.9 до 7.1.*; от 7.2 нататък

    История

    • 22 август 2026 Публикувано

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    CVE-2026-74729: Linux | freedomonline.bg