CVE-2026-63973
Vulnerability Scoring
Analysis In Progress
CVE-2026-63973 Vulnerability Analysis & Exploit Details
CVE-2026-63973
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-2026-63973 Details
Status: Received on 19 Jul 2026, 16:17 UTC
Published on: 19 Jul 2026, 16:17 UTC
CVSS Release:
CVE-2026-63973 Vulnerability Summary
CVE-2026-63973: In the Linux kernel, the following vulnerability has been resolved: net: mana: Add NULL guards in teardown path to prevent panic on attach failure When queue allocation fails partway through, the error cleanup frees and NULLs apc->tx_qp and apc->rxqs. Multiple teardown paths such as mana_remove(), mana_change_mtu() recovery, and internal error handling in mana_alloc_queues() can subsequently call into functions that dereference these pointers without NULL checks: - mana_chn_setxdp() dereferences apc->rxqs[0], causing a NULL pointer dereference panic (CR2: 0000000000000000 at mana_chn_setxdp+0x26). - mana_destroy_vport() iterates apc->rxqs without a NULL check. - mana_fence_rqs() iterates apc->rxqs without a NULL check. - mana_dealloc_queues() iterates apc->tx_qp without a NULL check. Add NULL guards for apc->rxqs in mana_fence_rqs(), mana_destroy_vport(), and before the mana_chn_setxdp() call. Add a NULL guard for apc->tx_qp in mana_dealloc_queues() to skip TX queue draining when TX queues were never allocated or already freed.
Assessing the Risk of CVE-2026-63973
Access Complexity Graph
The exploitability of CVE-2026-63973 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-2026-63973
No exploitability data is available for CVE-2026-63973.
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-2026-63973, 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-2026-63973, 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-2026-63973 does not compromise confidentiality.
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Integrity:
None
CVE-2026-63973 does not impact data integrity.
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Availability:
None
CVE-2026-63973 does not affect system availability.
CVE-2026-63973 References
External References
- https://git.kernel.org/stable/c/0a9c520fdcb1cb2e79c163c12d359b5e1ee40007
- https://git.kernel.org/stable/c/17bfe0a8c014ee1d542ad352cd6a0a505361664a
- https://git.kernel.org/stable/c/26a96fa81496afe7d162d172ccdc8cb9dbc685d2
- https://git.kernel.org/stable/c/95e414f8324385771bdfd6d497a01d5593813ccb
- https://git.kernel.org/stable/c/da7e4a1aaf397af6a094f640c92d6bc7564c10db
- https://git.kernel.org/stable/c/da87896f34e0a51489811d1a684e2953099ca98f
CWE Common Weakness Enumeration
Unknown
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