Review reviewHigh

CVE-2025-40253

Linux

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
8.8
EPSS
0.29%
21.5% percentile
CISA KEV
Not listed
Published
2025.12.05
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.29%
Technical severityCVSS 8.8

Vulnerability overview

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 product and versions

Product
Linux
Affected versions
>= 467ddbbe7e749d558f13e640f50f546149c930b3 < 06f1dd1de0d33dbfbd2e1fc9fc57d8895f730de2, >= 4d3c6d741816539b57fa1110c3f765a8c176d7b4 < 6bf8ccaabce8cebb6cb1f255c93d0acdfe95c17a, >= 2bd57101c3ecf3f8c0da1d26c2b6ad511adc6d50 < 7616e2eee679746d526c7f5befd4eedb995935b5, >= 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a < 43096dab8cc60fc39133205fd149a54d3acebea8, >= 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a < 3b177b2ded563df16f6d5920671ffcfe5915d472, >= 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a < b9dbfb1b5699f9f1e4991f96741bdf9047147589, >= 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a < 7ff76f8dc6b550f8d16487bf3cebc278be720b5c, >= 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a < da02a1824884d6c84c5e5b5ac373b0c9e3288ec2, >= 36933de59f67029e5739a98393891f9b94f27e0f, >= d886b4292a1c5b4facdb2dfdc31f0fecc71df898, >= 4c9ba0fed125deba8416b995b0c274b0804c0c24, >= ea0053af5dab4d63a9c44563973fb2f3bfd9eb2b, >= 5.4.195 < 5.4.302, >= 5.10.117 < 5.10.247, >= 5.15.41 < 5.15.197, >= 4.9.315 < 4.10, >= 4.14.280 < 4.15, >= 4.19.244 < 4.20, >= 5.17.9 < 5.18, >= 5.18
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2025-40253 — Linux | SECUFOCUS NOW