What is CVE-2025-40253?

CVE-2025-40253 is a high-severity vulnerability in Linux. CVSS score: 8.8/10. Published 2025-12-04.

How severe is CVE-2025-40253?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Linux

CVE-2025-40253

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.

EPSS: 0.002 (8.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions 5.15.41, 2bd57101c3ecf3f8c0da1d26c2b6ad511adc6d50, 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a

References

Frequently asked questions

What is CVE-2025-40253?: CVE-2025-40253 is a high-severity vulnerability in Linux. CVSS score: 8.8/10. Published 2025-12-04.
How severe is CVE-2025-40253?: High severity. CVSS v3 base score is 8.8 out of 10.