CVE-2022-50313: erofs: fix order >= MAX_ORDER warning due to crafted negative i_size

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: 2025-09-15 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: erofs: fix order >= MAX_ORDER warning due to crafted negative i_size As syzbot reported [1], the root cause is that i_size field is a signed type, and negative i_size is also less than EROFS_BLKSIZ. As a consequence, it's handled as fast symlink unexpectedly. Let's fall back to the generic path to deal with such unusual i_size. [1] https://lore.kernel.org/r/000000000000ac8efa05e7feaa1f@google.com

Affected products

Linux kernel: from 4.19 before 5.4.289; from 5.5 before 5.10.233; from 5.11 before 5.15.82; from 5.16 before 5.19.17; from 6.0 before 6.0.3 — fixed in 5.10.233, 5.15.82, 5.19.17, 5.4.289, 6.0.3

How to fix

Upgrade to a fixed version: Linux kernel 5.10.233, 5.15.82, 5.19.17, 5.4.289. Check the vendor advisory for mitigations.

References

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