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.
Affected versions
Linux kernel versions
5.4.195,
5.10.117,
5.15.41,
4.9.315,
4.14.280,
4.19.244,
5.17.9,
5.18
and later are affected. Fixed in
5.4.302,
5.10.247,
5.15.197,
6.1.159,
6.6.118,
6.12.60,
6.17.10,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40253 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/06f1dd1de0d33dbfbd2e1fc9fc57d8895f730de2
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PatchKernel patch commithttps://git.kernel.org/stable/c/3b177b2ded563df16f6d5920671ffcfe5915d472
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PatchKernel patch commithttps://git.kernel.org/stable/c/43096dab8cc60fc39133205fd149a54d3acebea8
Frequently asked questions
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What is CVE-2025-40253?
CVE-2025-40253 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.4.195 onward and has been patched in 5.4.302, 5.10.247, 5.15.197 and others. CVE-2025-40253 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40253?
Yes — CVE-2025-40253 has been patched. Fixed versions include 5.4.302, 5.10.247, 5.15.197 and others. If you are running Linux kernel 5.4.195 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40253 actively exploited?
No — CVE-2025-40253 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.