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NVD / CVE Program· CNA Linux

CVE-2026-74719: net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 06734dfeaeba886aab1bf147249195b888ac3e4d, 10cb31b2b74cb664c6c95cf72364d7d5c483ab82, 976245094925bab9bc39366b2e9ab44ffcde61d0; 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 06734dfeaeba886aab1bf147249195b888ac3e4d, 10cb31b2b74cb664c6c95cf72364d7d5c483ab82, 976245094925bab9bc39366b2e9ab44ffcde61d0; 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 qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler() The SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in smc_llc_event_handler() stores an incoming qentry into the local LLC flow without first checking whether a qentry is already pending. If a malicious or buggy peer sends a second CONFIRM_LINK or ADD_LINK_CONT request while a flow is active and flow->qentry is already set, smc_llc_flow_qentry_set() overwrites the pointer without freeing the previous allocation, leaking one kmalloc-96 object per spurious message. The sibling SMC_LLC_DELETE_LINK branch already has the correct !flow->qentry guard. Apply the same guard to the CONFIRM_LINK/ADD_LINK_CONT branch so that a duplicate message when qentry is already occupied falls through to break and is freed by the kfree(qentry) at the out: label, rather than silently leaking the existing allocation. The response direction (smc_llc_rx_response()) is unaffected: it already guards with flow->qentry at the equivalent site and drops duplicate responses correctly.

—No exploit Fix available
Published
Aug 22, 2026
Updated
Oct 14, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • 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

    • 5.8affected
    • 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 and later · before e384f3cba6ea709f5b2272b1770db4ce14047f78affected · git
    • 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 and later · before a1e980d7a9e7ee6faf4f5fd7b450413b969af26daffected · git
    • 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 and later · before e0eb87677c76b157cdf8eb7c1f19e56227165a33affected · git
    • 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 and later · before 06734dfeaeba886aab1bf147249195b888ac3e4daffected · git
    • 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 and later · before c23c409228629107203d3c3e95fff1473173f1a6affected · git
    • 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 and later · before 10cb31b2b74cb664c6c95cf72364d7d5c483ab82affected · git
    • 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 and later · before bfc336a9fbbf09805f3dfe25c195a4db90af2846affected · git
    • 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 and later · before 976245094925bab9bc39366b2e9ab44ffcde61d0affected · git
    • before 5.8not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.9-17.1.9-1

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-2026-74717Aug 22, 2026 · net/mlx5: fw_tracer, return NULL on create error
    30Monitor
  • ← EarlierCVE-2026-74718Aug 22, 2026 · devlink: fix net namespace reference leak in reload
    0Monitor
  • Later →CVE-2026-74720Aug 22, 2026 · bpf: Preserve pointer state for commuted arithmetic
    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 Linux06734dfeaeba886aab1bf147249195b888ac3e4dVendor (CNA)
Linux Linux10cb31b2b74cb664c6c95cf72364d7d5c483ab82Vendor (CNA)
Linux Linux976245094925bab9bc39366b2e9ab44ffcde61d0Vendor (CNA)
Linux Linuxa1e980d7a9e7ee6faf4f5fd7b450413b969af26dVendor (CNA)
Linux Linuxbfc336a9fbbf09805f3dfe25c195a4db90af2846Vendor (CNA)
Linux Linuxc23c409228629107203d3c3e95fff1473173f1a6Vendor (CNA)
Linux Linuxe0eb87677c76b157cdf8eb7c1f19e56227165a33Vendor (CNA)
Linux Linuxe384f3cba6ea709f5b2272b1770db4ce14047f78Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.152.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package 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).

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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 (7 more)

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

All records