BaseFortify

Publication date: 2025-12-04

Last updated on: 2025-12-06

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: s390/ctcm: Fix double-kfree The function 'mpc_rcvd_sweep_req(mpcginfo)' is called conditionally from function 'ctcmpc_unpack_skb'. It frees passed mpcginfo. After that a call to function 'kfree' in function 'ctcmpc_unpack_skb' frees it again. Remove 'kfree' call in function 'mpc_rcvd_sweep_req(mpcginfo)'. Bug detected by the clang static analyzer.

CVSS Scores

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Meta Information

Published

2025-12-04

Last Modified

2025-12-06

Generated

2026-07-06

AI Q&A

2025-12-04

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40253

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability is a double-free bug in the Linux kernel's s390/ctcm component. Specifically, the function 'mpc_rcvd_sweep_req(mpcginfo)' frees a memory object 'mpcginfo', and then the function 'ctcmpc_unpack_skb' also calls 'kfree' on the same object, causing it to be freed twice. This can lead to undefined behavior or potential security issues. The fix involved removing the redundant 'kfree' call in 'mpc_rcvd_sweep_req'.

Impact Analysis

A double-free vulnerability can lead to memory corruption, which attackers might exploit to cause system crashes, execute arbitrary code, or escalate privileges. In this case, since it is in the Linux kernel, exploitation could compromise system stability or security.

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