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NVD / CVE Program· CNA Linux

CVE-2026-74631: net: smc: fix splice entry lifetime imbalance in smc_rx_splice

HighCVSS 8.4 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 33/100)

  • 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: 0.13% (FIRST EPSS).
  • Someone with local access to the system 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 07ad246529d136d5ef441d5ab4c305d132ff3090, 0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0, 4515c78f4d9fd577270f012efeb062ea58b3682d; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 07ad246529d136d5ef441d5ab4c305d132ff3090, 0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0, 4515c78f4d9fd577270f012efeb062ea58b3682d; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 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: net: smc: fix splice entry lifetime imbalance in smc_rx_splice smc_rx_splice() passes pages to splice_to_pipe() before taking the references that cover the lifetime of each splice entry. In the VM-backed RMB path, splice_to_pipe() may drop unqueued entries through smc_rx_spd_release(), while queued entries are released later via the pipe buffer callback. The old post-splice accounting also derives the number of queued VM pages from an offset mutated while building the descriptor, and a multi-page splice pairs one sock_hold() with multiple sock_put() calls. Take the page and socket references for every candidate entry before splice_to_pipe(), and drop the matching private state, page reference, and socket reference from smc_rx_spd_release() for entries that never get queued. This fixes a refcount imbalance that can underflow page refcounts and trigger a use-after-free.

Published
Aug 22, 2026
Updated
Oct 16, 2026
EPSS
0.1% · 3th percentile
CWE
—

Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
33 / 40 · 8.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.4
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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  • Not in KEV: no record of exploitation in the wild
  • 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

    • 4.18affected
    • 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f and later · before 7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cbaffected · git
    • 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f and later · before 07ad246529d136d5ef441d5ab4c305d132ff3090affected · git
    • 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f and later · before c841789e456ec6751342fa800639ce8e82ff0e6baffected · git
    • 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f and later · before af02c67ce654356c58db20a0bb2db33ace3b07a8affected · git
    • 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f and later · before ca8342b5fc24c249fdb998468f6a168b457c67e5affected · git
    • 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f and later · before 0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0affected · git
    • 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f and later · before 4515c78f4d9fd577270f012efeb062ea58b3682daffected · git
    • 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f and later · before 5d9686af2976741bbd79b150d1c9e60b81e7f12eaffected · git
    • before 4.18not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2

+56

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-2026-74629Aug 22, 2026 · net/dibs: Correct freeing of dmb_clientid_arr
    35Monitor
  • ← EarlierCVE-2026-74630Aug 22, 2026 · ipv6: prevent in6_dev_get() from resurrecting inet6_dev
    31Monitor
  • Later →CVE-2026-74632Aug 22, 2026 · mm/huge_memory: fix huge_zero_pfn race
    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 Linux07ad246529d136d5ef441d5ab4c305d132ff3090Vendor (CNA)
Linux Linux0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0Vendor (CNA)
Linux Linux4515c78f4d9fd577270f012efeb062ea58b3682dVendor (CNA)
Linux Linux5d9686af2976741bbd79b150d1c9e60b81e7f12eVendor (CNA)
Linux Linux7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cbVendor (CNA)
Linux Linuxaf02c67ce654356c58db20a0bb2db33ace3b07a8Vendor (CNA)
Linux Linuxc841789e456ec6751342fa800639ce8e82ff0e6bVendor (CNA)
Linux Linuxca8342b5fc24c249fdb998468f6a168b457c67e5Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.152.1-1 · Release NotesMicrosoft (MSRC)
almalinux:kernel6.12.0-211.69.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.69.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.69.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.69.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.69.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.69.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.69.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.69.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.69.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.69.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.69.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.69.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)
rocky linux:kernel0:6.12.0-211.69.1.el10_2 · Rocky Linux:10Package registry (OSV)

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system 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
Local
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:L/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.

References

Show all references (7 more)

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

All records