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CVE-2026-31715: 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: f2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io() The xfstests case "generic/107" and syzbot have both reported a NULL pointer dereference. The concurrent scenario that triggers the panic is as follows: F2FS_WB_CP_DATA write callback umount - f2fs_write_checkpoint - f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA) - blk_mq_end_request - bio_endio - f2fs_write_end_io : dec_page_count(sbi, F2FS_WB_CP_DATA) : wake_up(&sbi->cp_wait) - kill_f2fs_super - kill_block_super - f2fs_put_super : iput(sbi->node_inode) : sbi->node_inode = NULL : f2fs_in_warm_node_list - is_node_folio // sbi->node_inode is NULL and panic The root cause is that f2fs_put_super() calls iput(sbi->node_inode) and sets sbi->node_inode to NULL after sbi->nr_pages[F2FS_WB_CP_DATA] is decremented to zero. As a result, f2fs_in_warm_node_list() may dereference a NULL node_inode when checking whether a folio belongs to the node inode, leading to a panic. This patch fixes the issue by calling f2fs_in_warm_node_list() before decrementing sbi->nr_pages[F2FS_WB_CP_DATA], thus preventing the use-after-free condition.

    Засегнати продукти

    • Linux Linux: 50fa53eccf9f911a5b435248a2b0bd484fd82e5e преди 7dbdab4430e4654db9aacef12b9b3b8b29ca25cb; 50fa53eccf9f911a5b435248a2b0bd484fd82e5e преди ffb94770dbdfb5411be5d9f44a960b010ec890ad; 50fa53eccf9f911a5b435248a2b0bd484fd82e5e преди 0d40b26377f891e6dcb6efaf8ef9374c99be1b1d; 50fa53eccf9f911a5b435248a2b0bd484fd82e5e преди 1171f329cf1c175321251ac40fd126150d7ad1e8; 50fa53eccf9f911a5b435248a2b0bd484fd82e5e преди 7be222de96c0f9eee6e65eeb017ef855ee185cfa; 50fa53eccf9f911a5b435248a2b0bd484fd82e5e преди 963d2e24d9d92a31e6773b0f642214f10013ebf7; 50fa53eccf9f911a5b435248a2b0bd484fd82e5e преди 188bb65f247a7a7c62f287c9a263aee3cad96fa5; 50fa53eccf9f911a5b435248a2b0bd484fd82e5e преди 2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53
    • Linux Linux: 4.19; преди 4.19; 5.10.259 до 5.10.*; 5.15.210 до 5.15.*; 6.1.176 до 6.1.*; 6.6.140 до 6.6.*; 6.12.86 до 6.12.*; 6.18.25 до 6.18.*; 7.0.2 до 7.0.*; от 7.1 нататък

    История

    • 1 май 2026 Публикувано

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    Първоизточници

    CVE-2026-31715: Linux | freedomonline.bg