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CVE-2026-90418

nilfs2: fix BUG in nilfs_copy_dirty_pages() on dirty state mismatch PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected 8c26c4e2694a163d525976e804d81cd955bbb40c before 5166a21b12f549774f2983fa86d2526ea9e66ace; affected 8c26c4e2694a163d525976e804d81cd955bbb40c before 4e1f21e7540b25d83f86b50780836ed7d2afcc93; affected 8c26c4e2694a163d525976e804d81cd955bbb40c before 3904fb0ee741ebbbc27ec8f50a9bb6cd31e8af05; affected 8c26c4e2694a163d525976e804d81cd955bbb40c before f181155baf0c93a74ebe804c6cecbe970e78ee9e; affected 8c26c4e2694a163d525976e804d81cd955bbb40c before 66f4ad3ce158902e5f98afea93189972ed8750c2
Linux / Linuxaffected 3.10; unaffected 0 before 3.10; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References