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NVD / CVE Program· CNA Linux

CVE-2025-40253: s390/ctcm: Fix double-kfree

Noroxi assessment

Priority: Monitor (action score 35/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.30% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 06f1dd1de0d33dbfbd2e1fc9fc57d8895f730de2, 3b177b2ded563df16f6d5920671ffcfe5915d472, 4.10.

Low priority for now. Upgrade to Linux Linux 06f1dd1de0d33dbfbd2e1fc9fc57d8895f730de2, 3b177b2ded563df16f6d5920671ffcfe5915d472, 4.10 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Dec 4, 2025
Updated
Oct 19, 2026
EPSS
0.3% · 22th percentile
CWE
—

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 36933de59f67029e5739a98393891f9b94f27e0f, d886b4292a1c5b4facdb2dfdc31f0fecc71df898, 4c9ba0fed125deba8416b995b0c274b0804c0c24, ea0053af5dab4d63a9c44563973fb2f3bfd9eb2b, 5.18affected
    • 467ddbbe7e749d558f13e640f50f546149c930b3 and later · before 06f1dd1de0d33dbfbd2e1fc9fc57d8895f730de2affected · git
    • 4d3c6d741816539b57fa1110c3f765a8c176d7b4 and later · before 6bf8ccaabce8cebb6cb1f255c93d0acdfe95c17aaffected · git
    • 2bd57101c3ecf3f8c0da1d26c2b6ad511adc6d50 and later · before 7616e2eee679746d526c7f5befd4eedb995935b5affected · git
    • 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a and later · before 43096dab8cc60fc39133205fd149a54d3acebea8affected · git
    • 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a and later · before 3b177b2ded563df16f6d5920671ffcfe5915d472affected · git
    • 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a and later · before b9dbfb1b5699f9f1e4991f96741bdf9047147589affected · git
    • 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a and later · before 7ff76f8dc6b550f8d16487bf3cebc278be720b5caffected · git
    • 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a and later · before da02a1824884d6c84c5e5b5ac373b0c9e3288ec2affected · git
    • 5.4.195 and later · before 5.4.302affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:11linux-6.1before 6.1.159-1~deb11u16.1.159-1~deb11u1
Debian:12linuxbefore 6.1.159-16.1.159-1
Debian:13linuxbefore 6.12.63-16.12.63-1
Debian:14linuxbefore 6.17.10-16.17.10-1
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-64kbbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-defaultbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-default-basebefore 6.4.0-150600.23.92.1.150600.12.42.26.4.0-150600.23.92.1.150600.12.42.2
openSUSE:Leap 15.6kernel-docsbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-obs-buildbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-sourcebefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-symsbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 15.6kernel-zfcpdumpbefore 6.4.0-150600.23.92.16.4.0-150600.23.92.1
openSUSE:Leap 16.0dtb-aarch64before 6.12.0-160000.28.16.12.0-160000.28.1
openSUSE:Leap 16.0kernel-64kbbefore 6.12.0-160000.28.16.12.0-160000.28.1
openSUSE:Leap 16.0kernel-azurebefore 6.12.0-160000.28.16.12.0-160000.28.1
openSUSE:Leap 16.0kernel-defaultbefore 6.12.0-160000.28.16.12.0-160000.28.1
openSUSE:Leap 16.0kernel-default-basebefore 6.12.0-160000.27.1.160000.2.86.12.0-160000.27.1.160000.2.8
openSUSE:Leap 16.0kernel-docsbefore 6.12.0-160000.28.16.12.0-160000.28.1
openSUSE:Leap 16.0kernel-kvmsmallbefore 6.12.0-160000.28.16.12.0-160000.28.1
openSUSE:Leap 16.0kernel-obs-buildbefore 6.12.0-160000.28.16.12.0-160000.28.1

+46

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-40250Dec 4, 2025 · net/mlx5: Clean up only new IRQ glue on request_irq() failure
    31Monitor
  • ← EarlierCVE-2025-40252Dec 4, 2025 · net: qlogic/qede: fix potential out-of-bounds read in qede_tpa_cont() and qede_tpa_end()
    39Monitor
  • Later →CVE-2025-40254Dec 4, 2025 · net: openvswitch: remove never-working support for setting nsh fields
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux06f1dd1de0d33dbfbd2e1fc9fc57d8895f730de2Vendor (CNA)
Linux Linux3b177b2ded563df16f6d5920671ffcfe5915d472Vendor (CNA)
Linux Linux4.10Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux43096dab8cc60fc39133205fd149a54d3acebea8Vendor (CNA)
Linux Linux5.10.247Vendor (CNA)
Linux Linux5.15.197Vendor (CNA)
Linux Linux5.18Vendor (CNA)
Linux Linux5.4.302Vendor (CNA)
Linux Linux6bf8ccaabce8cebb6cb1f255c93d0acdfe95c17aVendor (CNA)
Linux Linux7616e2eee679746d526c7f5befd4eedb995935b5Vendor (CNA)
Linux Linux7ff76f8dc6b550f8d16487bf3cebc278be720b5cVendor (CNA)
Linux Linuxb9dbfb1b5699f9f1e4991f96741bdf9047147589Vendor (CNA)
Linux Linuxda02a1824884d6c84c5e5b5ac373b0c9e3288ec2Vendor (CNA)
debian:linux6.1.159-1 · Debian:12Package registry (OSV)
debian:linux-6.16.1.159-1~deb11u1 · Debian:11Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.92.1.150600.12.42.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-qa6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-zfcpdump6.4.0-150600.23.92.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:kernel-64kb6.4.0-150600.23.92.1 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)

+12

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records