Reachable assertion in Linux kernel - CVE-2025-21654
Published: January 20, 2025 / Updated: May 11, 2025
Vulnerability identifier: #VU103039
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-21654
CWE-ID: CWE-617
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 perform a denial of service (DoS) attack.
The vulnerability exists due to reachable assertion within the ovl_connect_layer(), ovl_check_encode_origin(), ovl_dentry_to_fid() and ovl_encode_fh() functions in fs/overlayfs/export.c. A local user can perform a denial of service (DoS) attack.
How to mitigate CVE-2025-21654
Install update from vendor's website.
Sources
- https://git.kernel.org/stable/c/3c7c90274ae339e1ad443c9be1c67a20b80b9c76
- https://git.kernel.org/stable/c/a1a541fbfa7e97c1100144db34b57553d7164ce5
- https://git.kernel.org/stable/c/c45beebfde34aa71afbc48b2c54cdda623515037
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.10
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.72
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.73
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.74