CVE-2026-90418

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix BUG in nilfs_copy_dirty_pages() on dirty state mismatch Syzbot reported a kernel BUG triggered within nilfs_copy_dirty_pages(), which copies dirty DAT file folios/pages to its shadow page cache. The BUG occurs when a retrieved dirty folio/page unexpectedly loses its 'dirty' status. This issue arises because, since the commit referenced below, the 'dirty' flag of a folio/page can be cleared asynchronously after the filesystem detects metadata corruption and transitions to read-only mode. Resolve the issue by returning an -EROFS error if the filesystem has transitioned to read-only mode. Also change the behavior to issue a kernel warning only once instead of triggering a kernel BUG when this unexpected 'dirty' state is detected while the filesystem is not in read-only mode.

• https://git.kernel.org/stable/c/3904fb0ee741ebbbc27ec8f50a9bb6cd31e8af05
• https://git.kernel.org/stable/c/4e1f21e7540b25d83f86b50780836ed7d2afcc93
• https://git.kernel.org/stable/c/5166a21b12f549774f2983fa86d2526ea9e66ace
• https://git.kernel.org/stable/c/66f4ad3ce158902e5f98afea93189972ed8750c2
• https://git.kernel.org/stable/c/f181155baf0c93a74ebe804c6cecbe970e78ee9e

Published

Sep 17, 2026

Last Modified

Sep 17, 2026

Status

Received

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