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NVD / CVE Program· CNA Linux

CVE-2026-97419: hsr: broadcast netlink notifications in the device's net namespace

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 016b8eaca53bfd57e84ea28b5c9174c89d7679e1, 24b3f1a9982c176d05a523a4bb9314dca0db4488, 25b69f281cebe051a8e4ab19950a939c27ead1bc; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 016b8eaca53bfd57e84ea28b5c9174c89d7679e1, 24b3f1a9982c176d05a523a4bb9314dca0db4488, 25b69f281cebe051a8e4ab19950a939c27ead1bc; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: hsr: broadcast netlink notifications in the device's net namespace The HSR generic netlink family sets .netnsok = true. HSR devices can live in network namespaces other than init_net. Two async notifiers broadcast events with genlmsg_multicast(). They are hsr_nl_ringerror() and hsr_nl_nodedown(). That helper delivers only on the default genl socket in init_net. So the events always land in init_net. The network namespace of the device does not matter. This has two effects. A listener in the device's own namespace never sees its own ring error and node down events. A privileged listener in init_net receives events from HSR devices in other namespaces. The payload carries the peer node MAC (HSR_A_NODE_ADDR) and the slave port ifindex (HSR_A_IFINDEX). Switch both callers to genlmsg_multicast_netns(). Other families with .netnsok = true already do this. Examples are gtp, ovpn, team, batman-adv, netdev-genl, ethtool and handshake. hsr_nl_ringerror() already has the slave port. It uses dev_net(port->dev). hsr_nl_nodedown() takes the namespace from the master port via hsr_port_get_hsr().

—No exploit Fix available
Published
Sep 24, 2026
Updated
Oct 3, 2026
EPSS
0.1% · 6th 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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  • 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?

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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

    • 3.13affected
    • f421436a591d34fa5279b54a96ac07d70250cc8d and later · before 9f13023607f1e95bd098cc49052b0c8955d334f9affected · git
    • f421436a591d34fa5279b54a96ac07d70250cc8d and later · before 798ccb12810a58a37264685b28ddf990ef49559caffected · git
    • f421436a591d34fa5279b54a96ac07d70250cc8d and later · before 9bf45feee630be868ab54e3d0f3d430c07471f0eaffected · git
    • f421436a591d34fa5279b54a96ac07d70250cc8d and later · before 016b8eaca53bfd57e84ea28b5c9174c89d7679e1affected · git
    • f421436a591d34fa5279b54a96ac07d70250cc8d and later · before 25b69f281cebe051a8e4ab19950a939c27ead1bcaffected · git
    • f421436a591d34fa5279b54a96ac07d70250cc8d and later · before 24b3f1a9982c176d05a523a4bb9314dca0db4488affected · git
    • f421436a591d34fa5279b54a96ac07d70250cc8d and later · before a762fabd7ef9a6cc07258684138f9c3f078d0326affected · git
    • before 3.13not affected · semver
    • 5.10.271 and later · up to and including 5.10.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

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-2026-97417Sep 24, 2026 · netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack()
    30Monitor
  • ← EarlierCVE-2026-97418Sep 24, 2026 · ALSA: es18xx: check control allocation before private data setup
    0Monitor
  • Later →CVE-2026-97420Sep 24, 2026 · bpf: NUL-terminate replaced sysctl value
    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 Linux016b8eaca53bfd57e84ea28b5c9174c89d7679e1Vendor (CNA)
Linux Linux24b3f1a9982c176d05a523a4bb9314dca0db4488Vendor (CNA)
Linux Linux25b69f281cebe051a8e4ab19950a939c27ead1bcVendor (CNA)
Linux Linux798ccb12810a58a37264685b28ddf990ef49559cVendor (CNA)
Linux Linux9bf45feee630be868ab54e3d0f3d430c07471f0eVendor (CNA)
Linux Linux9f13023607f1e95bd098cc49052b0c8955d334f9Vendor (CNA)
Linux Linuxa762fabd7ef9a6cc07258684138f9c3f078d0326Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~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 (6 more)

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

All records