CVE-2024-56750: erofs: fix blksize < PAGE_SIZE for file-backed mounts

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-12-29 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: erofs: fix blksize < PAGE_SIZE for file-backed mounts Adjust sb->s_blocksize{,_bits} directly for file-backed mounts when the fs block size is smaller than PAGE_SIZE. Previously, EROFS used sb_set_blocksize(), which caused a panic if bdev-backed mounts is not used.

Affected products

Linux kernel: from 6.12 before 6.12.2 — fixed in 6.12.2

How to fix

Upgrade to a fixed version: Linux kernel 6.12.2. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/679d8537e5748241c71ac97a6b6dc919eae31716
https://git.kernel.org/stable/c/bae0854160939a64a092516ff1b2f221402b843b

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