Use-after-free in Linux kernel - CVE-2025-40257
Published: December 4, 2025
Vulnerability identifier: #VU119163
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-40257
CWE-ID: CWE-416
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 escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the mptcp_remove_anno_list_by_saddr(), mptcp_pm_del_add_timer() and mptcp_pm_free_anno_list() functions in net/mptcp/pm.c. A local user can escalate privileges on the system.
How to mitigate CVE-2025-40257
Install update from vendor's repository.