CVE-2026-31514

In the Linux kernel, the following vulnerability has been resolved:

erofs: set fileio bio failed in short read case

For file-backed mount, IO requests are handled by vfs_iocb_iter_read().

However, it can be interrupted by SIGKILL, returning the number of

bytes actually copied. Unused folios in bio are unexpectedly marked

as uptodate.

vfs_read

filemap_read

filemap_get_pages

filemap_readahead

erofs_fileio_readahead

erofs_fileio_rq_submit

vfs_iocb_iter_read

filemap_read

filemap_get_pages <= detect signal

erofs_fileio_ki_complete <= set all folios uptodate

This patch addresses this by setting short read bio with an error

directly.