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NVD / CVE Program· CNA Linux

CVE-2026-80733: net: remove WARN_ON_ONCE() from sk_mc_loop()

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 0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f, 3.15, 3.19; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.

Low priority for now. Upgrade to Linux Linux 0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f, 3.15, 3.19; 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: remove WARN_ON_ONCE() from sk_mc_loop() sk_mc_loop() can be called for sockets that are neither AF_INET nor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet socket over virtual devices such as VRF or ipvlan). In such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls through the switch statement and triggers WARN_ON_ONCE(1). Non-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP options, so loopback should default to true without generating a warning.

—No exploit Fix available
Published
Sep 3, 2026
Updated
Sep 3, 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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Noroxi analysis

What does it mean in your environment?

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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

    • c91f81773cd4bbebfe744e9ab30a7ce093f9b930, c8c30b2b17f2133e953850c547e3902c3a3d80e2, 3fe207e4637a2e792c46a08666aa722f77d7f8f7, 4.0affected
    • f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 and later · before 97133c4d42654578fab95abe47359ebe784dde18affected · git
    • f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 and later · before f625c742b33dc137c209dd13d1c5f12b1c18d71caffected · git
    • f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 and later · before ad7fa2f411cb30f63d6725f111be134064cdb718affected · git
    • f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 and later · before d2adc4e80b29e58b5162ae09f0f657a215806c8caffected · git
    • f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 and later · before ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfeaffected · git
    • f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 and later · before c8f256dc849205ccb2bd78bd99a3497b972b44e0affected · git
    • f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 and later · before 0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1faffected · git
    • f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 and later · before b8a39a09ae4eaae04309e1e38ed6a1101d967496affected · git
    • 3.14.40 and later · before 3.15affected · 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-2026-80730Sep 3, 2026 · ring-buffer: Fix crash passing ERR_PTR to kthread_stop()
    0Monitor
  • ← EarlierCVE-2026-80732Sep 3, 2026 · ata: pata_sl82c105: fix bridge revision use-after-free
    31Monitor
  • Later →CVE-2026-80735Sep 3, 2026 · ovpn: ensure socket is owned by ovpn before deref sk_user_data
    29Monitor

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 Linux0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1fVendor (CNA)
Linux Linux3.15Vendor (CNA)
Linux Linux3.19Vendor (CNA)
Linux Linux3.20Vendor (CNA)
Linux Linux97133c4d42654578fab95abe47359ebe784dde18Vendor (CNA)
Linux Linuxad7dbb1d14b1b4406eca8ef9478e8de312ba0cfeVendor (CNA)
Linux Linuxad7fa2f411cb30f63d6725f111be134064cdb718Vendor (CNA)
Linux Linuxb8a39a09ae4eaae04309e1e38ed6a1101d967496Vendor (CNA)
Linux Linuxc8f256dc849205ccb2bd78bd99a3497b972b44e0Vendor (CNA)
Linux Linuxd2adc4e80b29e58b5162ae09f0f657a215806c8cVendor (CNA)
Linux Linuxf625c742b33dc137c209dd13d1c5f12b1c18d71cVendor (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).

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✗ → ✓

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References

Show all references (7 more)

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

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