CVE-2026-53174

HighCVSS 7.8/10Last modified Jul 6, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

ovl: keep err zero after successful ovl_cache_get()

ovl_iterate_merged() stores PTR_ERR(cache) in err before checking IS_ERR(cache). On success err holds the truncated cache pointer and can be returned as a bogus non-zero error.

The syzbot reproducer reaches this through overlay-on-overlay readdir:

getdents64 iterate_dir(outer overlay file) ovl_iterate_merged() ovl_cache_get() ovl_dir_read_merged() ovl_dir_read() iterate_dir(inner overlay file) ovl_iterate_merged()

Only compute PTR_ERR(cache) on the error path.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected software

VendorProductVersions
LinuxLinux>= d25e4b739f8378419f990983f2542160e79738c5, < e7051909a01bfb883bfa78b27514854068ac4b85; >= d25e4b739f8378419f990983f2542160e79738c5, < 1711b6ed6953cee5940ca4c3a6e77f1b3798cee2
LinuxLinux6.19

References

Timeline

Published
Jun 25, 2026
Last modified
Jul 6, 2026
NVD status
Analyzed

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CVE-2026-53174: High severity, CVSS 7.8 | Vulnix