CVE-2025-40253 json
s390/ctcm: Fix double-kfree
published 11mo ago modified 21d ago also EUVD-2025-201204
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 25%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Linux Linux 4.10, 4.15, 4.20, 5.4.302, 5.10.247, 5.15.197, 5.18, 6.1.159, 6.6.118, 6.12.60, 6.17.10, 6.18
- linux Debian 12 6.1.159-1
- linux Debian 13 6.12.63-1
- linux Debian 14 6.17.10-1
debian advisories DEBIAN-CVE-2025-40253
- linux Ubuntu 22.04 LTS 5.15.0-173.183
- linux Ubuntu 24.04 LTS 6.8.0-106.106
- linux Ubuntu 25.10 6.17.0-19.19
- linux-aws Ubuntu 22.04 LTS 5.15.0-1103.110
- linux-aws Ubuntu 24.04 LTS 6.8.0-1050.53
- linux-aws Ubuntu 25.10 6.17.0-1009.9
- linux-gcp Ubuntu 22.04 LTS 5.15.0-1103.112
- linux-gcp Ubuntu 24.04 LTS 6.8.0-1052.55
ubuntu advisories UBUNTU-CVE-2025-40253
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel-rt Linux Micro 6.2 6.12.0-160000.28.1
- kernel-64kb Linux Micro 6.2 6.12.0-160000.28.1
- kernel-source Linux Micro 6.2 6.12.0-160000.28.1
- kernel-default Linux Micro 6.2 6.12.0-160000.28.1
- kernel-default-base Linux Micro 6.2 6.12.0-160000.27.1.160000.2.8
- gdk-pixbuf Linux Micro 6.2 2.42.12-160000.4.1
- kernel-syms Linux Micro Extras 6.2 6.12.0-160000.28.1
- kernel-obs-build Linux Micro Extras 6.2 6.12.0-160000.28.1
suse advisories SUSE-SU-2026:2450-1SUSE-SU-2026:21237-1SUSE-SU-2026:21230-1SUSE-SU-2026:21255-1SUSE-SU-2026:21123-1SUSE-SU-2026:21114-1
- kernel-rt openSUSE Leap 16.0 6.12.0-160000.28.1
- dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.28.1
- kernel-64kb openSUSE Leap 16.0 6.12.0-160000.28.1
- kernel-syms openSUSE Leap 16.0 6.12.0-160000.28.1
- kernel-azure openSUSE Leap 16.0 6.12.0-160000.28.1
- kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.28.1
- kernel-source openSUSE Leap 16.0 6.12.0-160000.28.1
- kernel-default openSUSE Leap 16.0 6.12.0-160000.28.1
opensuse advisories openSUSE-SU-2026:20572-1
- git.kernel.org/stable/c/06f1dd1de0d33dbfbd2e1fc9fc57d8895f730de2 commit
- git.kernel.org/stable/c/6bf8ccaabce8cebb6cb1f255c93d0acdfe95c17a commit
- git.kernel.org/stable/c/7616e2eee679746d526c7f5befd4eedb995935b5 commit
- git.kernel.org/stable/c/43096dab8cc60fc39133205fd149a54d3acebea8 commit
- git.kernel.org/stable/c/3b177b2ded563df16f6d5920671ffcfe5915d472 commit
- git.kernel.org/stable/c/b9dbfb1b5699f9f1e4991f96741bdf9047147589 commit
- git.kernel.org/stable/c/7ff76f8dc6b550f8d16487bf3cebc278be720b5c commit
- git.kernel.org/stable/c/da02a1824884d6c84c5e5b5ac373b0c9e3288ec2 commit
Is CVE-2025-40253 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2025-40253 updated cvss 5.5
kernel: s390/ctcm: Fix double-kfree
-
Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernelaffected: no fix available “Fix deferred”
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 morenot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 25d ago
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Linux Linux
Classification
- Technology feeds
References
- git.kernel.org /stable/c/06f1dd1de0d33dbfbd2e1fc9fc57d8895f730de2
- git.kernel.org /stable/c/6bf8ccaabce8cebb6cb1f255c93d0acdfe95c17a
- git.kernel.org /stable/c/7616e2eee679746d526c7f5befd4eedb995935b5
- git.kernel.org /stable/c/43096dab8cc60fc39133205fd149a54d3acebea8
- git.kernel.org /stable/c/3b177b2ded563df16f6d5920671ffcfe5915d472
- git.kernel.org /stable/c/b9dbfb1b5699f9f1e4991f96741bdf9047147589
- git.kernel.org /stable/c/7ff76f8dc6b550f8d16487bf3cebc278be720b5c
- git.kernel.org /stable/c/da02a1824884d6c84c5e5b5ac373b0c9e3288ec2
Sources
- CVE List CVE-2025-40253
- NVD CVE-2025-40253
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.