CVE-2026-31514: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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 products

• Linux Linux Kernel: from 6.12.75, before 6.12.80 (fixed in 6.12.80); from 6.18.14, before 6.18.21 (fixed in 6.18.21); from 6.19.4, before 6.19.11 (fixed in 6.19.11)

Published 2026-04-22. Last modified 2026-06-17.