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NVD / CVE Program· CNA Linux

CVE-2026-68301: net: hsr: fix memory leak on slave unregistration by removing synced VLANs

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 21d48408479a17eb65568a765930adea37e4d804, 5.15.216, 6.1.183; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 21d48408479a17eb65568a765930adea37e4d804, 5.15.216, 6.1.183; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 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: hsr: fix memory leak on slave unregistration by removing synced VLANs When an HSR master device is brought UP, it auto-adds VLAN 0 via vlan_vid0_add(), which propagates VID 0 to its slave devices (slave A and B). If a slave device is later unregistered while HSR is active (e.g., during netns cleanup or interface destruction), hsr_del_port() is called to detach the slave port from the HSR master. However, hsr_del_port() currently does not delete the VLAN IDs that were synced to the slave device by HSR. As a result, the slave device retains a refcount on VID 0 (and any other synced VLANs). When the slave device is destroyed, its vlan_info / vlan_vid_info structure remains allocated, leading to a memory leak. Fix this by calling vlan_vids_del_by_dev(port->dev, master->dev) in hsr_del_port() before unlinking slave A or slave B ports, matching the propagation logic in hsr_ndo_vlan_rx_add_vid() / hsr_ndo_vlan_rx_kill_vid() and the cleanup behavior in bonding and team drivers.

—No exploit Fix available
Published
Aug 10, 2026
Updated
Nov 6, 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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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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

    • 6.13affected
    • 1100242709d5644856131a9dd25d32672ebe7357 and later · before ccc822e9e4f09a6c2ca73ad5334570441947f94faffected · git
    • a2accc07bdcfb0c7ab2cacdca6a1fe8267816efa and later · before 79ff0547676acdeceda445c3fce4071b0a887b70affected · git
    • 72dbae1f2f2159395089405c6c54632f2613f1be and later · before f72c312af6c7897ab0f8a2b5a63f917a207a4143affected · git
    • c707d2c5541d2bb94131968ad5dfeb06427a1dba and later · before 21d48408479a17eb65568a765930adea37e4d804affected · git
    • 1a8a63a5305e95519de6f941922dfcd8179f82e5 and later · before b5ded444621b6180df9f3d4e07045fc1fc1e8cd9affected · git
    • 1a8a63a5305e95519de6f941922dfcd8179f82e5 and later · before ae995b8002d3af134560a706c0e111a89e26317caffected · git
    • 1a8a63a5305e95519de6f941922dfcd8179f82e5 and later · before dcf15eaf5641812f1cfc5e96537380132a7da89daffected · git
    • 5.15.194 and later · before 5.15.216affected · semver
    • 6.1.153 and later · before 6.1.183affected · 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 6.12.101-1~deb12u16.12.101-1~deb12u1
Debian:13linuxbefore 6.12.101-16.12.101-1
Debian:14linuxbefore 7.1.6-17.1.6-1

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-2026-68299Aug 10, 2026 · vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets
    30Monitor
  • ← EarlierCVE-2026-68300Aug 10, 2026 · sctp: auth: verify auth requirement when auth_chunk is NULL
    39Monitor
  • Later →CVE-2026-68303Aug 10, 2026 · drm/vc4: hvs/v3d: Fix null dereference in unbind
    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 Linux21d48408479a17eb65568a765930adea37e4d804Vendor (CNA)
Linux Linux5.15.216Vendor (CNA)
Linux Linux6.1.183Vendor (CNA)
Linux Linux6.12.101Vendor (CNA)
Linux Linux6.6.148Vendor (CNA)
Linux Linux79ff0547676acdeceda445c3fce4071b0a887b70Vendor (CNA)
Linux Linuxae995b8002d3af134560a706c0e111a89e26317cVendor (CNA)
Linux Linuxb5ded444621b6180df9f3d4e07045fc1fc1e8cd9Vendor (CNA)
Linux Linuxccc822e9e4f09a6c2ca73ad5334570441947f94fVendor (CNA)
Linux Linuxdcf15eaf5641812f1cfc5e96537380132a7da89dVendor (CNA)
Linux Linuxf72c312af6c7897ab0f8a2b5a63f917a207a4143Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~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. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (6 more)

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

All records