CVE-2026-68301
Vulnerability Scoring
Analysis In Progress
CVE-2026-68301 Vulnerability Analysis & Exploit Details
CVE-2026-68301
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2026-68301 Details
Status: Received on 10 Aug 2026, 13:20 UTC
Last updated: 🕔 19 Aug 2026, 17:20 UTC
Originally published on: 🕐 10 Aug 2026, 13:20 UTC
Time between publication and last update: 9 days
CVSS Release:
CVE-2026-68301 Vulnerability Summary
CVE-2026-68301: 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.
Assessing the Risk of CVE-2026-68301
Access Complexity Graph
The exploitability of CVE-2026-68301 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2026-68301
No exploitability data is available for CVE-2026-68301.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2026-68301, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2026-68301, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2026-68301 does not compromise confidentiality.
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Integrity:
None
CVE-2026-68301 does not impact data integrity.
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Availability:
None
CVE-2026-68301 does not affect system availability.
CVE-2026-68301 References
External References
- https://git.kernel.org/stable/c/21d48408479a17eb65568a765930adea37e4d804
- https://git.kernel.org/stable/c/79ff0547676acdeceda445c3fce4071b0a887b70
- https://git.kernel.org/stable/c/ae995b8002d3af134560a706c0e111a89e26317c
- https://git.kernel.org/stable/c/b5ded444621b6180df9f3d4e07045fc1fc1e8cd9
- https://git.kernel.org/stable/c/ccc822e9e4f09a6c2ca73ad5334570441947f94f
- https://git.kernel.org/stable/c/dcf15eaf5641812f1cfc5e96537380132a7da89d
- https://git.kernel.org/stable/c/f72c312af6c7897ab0f8a2b5a63f917a207a4143
CWE Common Weakness Enumeration
Unknown
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