CVE-2026-31514

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/d1ba7d6b3cd1757b108d7b6856c92ae661d6c323
• https://git.kernel.org/stable/c/5cf3972c8221abdb1b464a14ccf8103d840b9085
• https://git.kernel.org/stable/c/5a5f23ef5431639db1ac3a0b274aef3a84cc413c
• https://git.kernel.org/stable/c/eade54040384f54b7fb330e4b0975c5734850b3c

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