erofs: set fileio bio failed in short read case (CVE-2026-31514)

Summary

erofs: set fileio bio failed in short read case

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Affected packages

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"6.12.75"},{"fixed":"6.12.80"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.18.14"},{"fixed":"6.18.21"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.4"},{"fixed":"6.19.11"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

BellSoft Alpaquita BELL-CVE-2026-31514 linux-lts Fixed in: 6.12.80-r0
Debian DEBIAN-CVE-2026-31514 linux Fixed in: 6.19.11-1
Ubuntu UBUNTU-CVE-2026-31514 linux-hwe-edge

Summary

Original description

Affected packages

Fix status by distribution

References