Out-of-bounds read in Linux kernel - CVE-2026-63815
Published: July 21, 2026
Vulnerability identifier: #VU138839
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-63815
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in f2fs_fill_dentries() and inline directory handling when mounting a crafted filesystem image and reading an inline directory. A local user can mount a specially crafted image and read a crafted directory to disclose sensitive information.
Exploitation requires the flexible_inline_xattr feature to be enabled.
How to mitigate CVE-2026-63815
Install security update from vendor's repository.