CVE-2022-49747: erofs/zmap.c: Fix incorrect offset calculation

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: 2025-03-27 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: erofs/zmap.c: Fix incorrect offset calculation Effective offset to add to length was being incorrectly calculated, which resulted in iomap->length being set to 0, triggering a WARN_ON in iomap_iter_done(). Fix that, and describe it in comments. This was reported as a crash by syzbot under an issue about a warning encountered in iomap_iter_done(), but unrelated to erofs. C reproducer: https://syzkaller.appspot.com/text?tag=ReproC&x=1037a6b2880000 Kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=e2021a61197ebe02 Dashboard link: https://syzkaller.appspot.com/bug?extid=a8e049cd3abd342936b6

Affected products

Linux kernel: from 5.15 before 5.15.92; from 5.16 before 6.1.10; 6.2-rc1, 6.2-rc2, 6.2-rc3, 6.2-rc4 — fixed in 5.15.92, 6.1.10

How to fix

Upgrade to a fixed version: Linux kernel 5.15.92, 6.1.10. Check the vendor advisory for mitigations.

References

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