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NVD / CVE Program· CNA Linux

CVE-2025-40168: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().

Noroxi assessment

Priority: Monitor (action score 32/100)

  • 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: 0.42% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 235f81045c008169cc4e1955b4a64e118eebe61b, 326e5cf301d0bec0a672aa834d8254c4f9df6255, 3f119c37aa293af41400cccb3d89fab8dcf774b0; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 235f81045c008169cc4e1955b4a64e118eebe61b, 326e5cf301d0bec0a672aa834d8254c4f9df6255, 3f119c37aa293af41400cccb3d89fab8dcf774b0; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match(). smc_clc_prfx_match() is called from smc_listen_work() and not under RCU nor RTNL. Using sk_dst_get(sk)->dev could trigger UAF. Let's use __sk_dst_get() and dst_dev_rcu(). Note that the returned value of smc_clc_prfx_match() is not used in the caller.

HighCVSS 8.1 · v3.1—No exploit Fix available
Published
Nov 12, 2025
Updated
Oct 19, 2026
EPSS
0.4% · 36th percentile
CWE
—

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.1
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.

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  • No public exploit code on record
  • A fix has been released

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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

    • 4.11affected
    • a046d57da19f812216f393e7c535f5858f793ac3 and later · before 3f119c37aa293af41400cccb3d89fab8dcf774b0affected · git
    • a046d57da19f812216f393e7c535f5858f793ac3 and later · before 4f5f52a5842937f945582a93cb9daed9ea526feeaffected · git
    • a046d57da19f812216f393e7c535f5858f793ac3 and later · before 326e5cf301d0bec0a672aa834d8254c4f9df6255affected · git
    • a046d57da19f812216f393e7c535f5858f793ac3 and later · before d26e80f7fb62d77757b67a1b94e4ac756bc9c658affected · git
    • a046d57da19f812216f393e7c535f5858f793ac3 and later · before 235f81045c008169cc4e1955b4a64e118eebe61baffected · git
    • before 4.11not affected · semver
    • 6.1.187 and later · up to and including 6.1.*not affected · semver
    • 6.6.156 and later · up to and including 6.6.*not affected · semver
    • 6.12.108 and later · up to and including 6.12.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-124.39.1.el10_16.12.0-124.39.1.el10_1
AlmaLinux:10kernel-docbefore 6.12.0-124.39.1.el10_16.12.0-124.39.1.el10_1
AlmaLinux:8bpftoolbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.105.1.el8_104.18.0-553.105.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.105.1.rt7.446.el8_104.18.0-553.105.1.rt7.446.el8_10

+96

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-2025-40166Nov 12, 2025 · drm/xe/guc: Check GuC running state before deregistering exec queue
    31Monitor
  • ← EarlierCVE-2025-40167Nov 12, 2025 · ext4: detect invalid INLINE_DATA + EXTENTS flag combination
    31Monitor
  • Later →CVE-2025-40169Nov 12, 2025 · bpf: Reject negative offsets for ALU ops
    31Monitor

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 Linux235f81045c008169cc4e1955b4a64e118eebe61bVendor (CNA)
Linux Linux326e5cf301d0bec0a672aa834d8254c4f9df6255Vendor (CNA)
Linux Linux3f119c37aa293af41400cccb3d89fab8dcf774b0Vendor (CNA)
Linux Linux4f5f52a5842937f945582a93cb9daed9ea526feeVendor (CNA)
Linux Linuxd26e80f7fb62d77757b67a1b94e4ac756bc9c658Vendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-abi-stablelists4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-core4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-cross-headers4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-core4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-devel4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-debug-modules-extra4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-devel4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-doc4.18.0-553.105.1.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-553.105.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-553.105.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-553.105.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-553.105.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-553.105.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-553.105.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-553.105.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-553.105.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-553.105.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-553.105.1.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)

+4

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.

No history yet (it accumulates with the daily EPSS job).

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

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
Network
Attack complexity
High
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:N/AC:H/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. Fix✗ → ✓

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

References

Show all references (4 more)

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

All records