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CVE-2026-92501: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: ext4: drain in-flight DIO before buffered write fallback generic/746 started failing intermittently on ext3 (no-extent inodes). The test triggers 'Page cache invalidation failure on direct I/O' warnings and subsequent fsync returns -EIO. Adding a 50ms delay between ext4_buffered_write_iter() and filemap_write_and_wait_range() in ext4_dio_write_iter() makes the race almost always reproducible. On no-extent inodes, DIO writes to holes cannot use unwritten extents, so ext4_iomap_alloc() leaves m_flags=0 and ext4_map_blocks() returns 0. The iomap layer then returns -ENOTBLK, causing fallback to buffered I/O. The fallback path in ext4_dio_write_iter() calls ext4_buffered_write_iter() which dirties pages, then does flush and invalidate. However, there's an unprotected window between ext4_buffered_write_iter() returning (with inode lock released) and the subsequent flush+invalidate. Concurrent async DIO completions from other threads can run kiocb_invalidate_post_direct_write() during this window. If pages have been re-dirtied, post-invalidation finds dirty pages and triggers the warning, setting -EIO in the error sequence. Consider a file with two 4k extents: [hole][written]. Thread A does DIO to the written extent, while thread B does DIO spanning both: kworker A (4k DIO, allocated block) kworker B (8k DIO, fallback) ----------------------------------- ---------------------------- inode_lock_shared() inode_lock_shared() iomap_dio_rw(): iomap_dio_rw(): kiocb_invalidate_pages -> clean iomap_begin -> -ENOTBLK submit_bio (async) dio->size = 0 inode_unlock_shared() inode_unlock_shared() [bio pending in block layer] /* fallback: lock released */ ext4_buffered_write_iter() inode_lock(exclusive)

    Засегнати продукти

    • Linux Linux: 378f32bab3714f04c4e0c3aee4129f6703805550 преди fd7e0dab20837b9ea1eeef7c26f78ace8ac8258c; 378f32bab3714f04c4e0c3aee4129f6703805550 преди f0af3ae09fb72382da1a5371bf6761b0264668e4; 378f32bab3714f04c4e0c3aee4129f6703805550 преди 7341e234927ff215f1d5d0bcfe04b74f53af378d; 378f32bab3714f04c4e0c3aee4129f6703805550 преди 74eee4ff9698a65b2e6e15dac0e50d6526ad5f20; 378f32bab3714f04c4e0c3aee4129f6703805550 преди d47cdadd6e49023f7ee248048463807f1214f1ee; 378f32bab3714f04c4e0c3aee4129f6703805550 преди 4e4e3eec506247c8f8bd8aaa1eb25e67016681a5; 378f32bab3714f04c4e0c3aee4129f6703805550 преди 9fd3ffc3c51c9deaba99bd7b338fff2d08f52416; 378f32bab3714f04c4e0c3aee4129f6703805550 преди 15cdefd0c0522f9d5e12d947fa04f4c11649b699
    • Linux Linux: 5.5; преди 5.5; 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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