CVE-2026-63834
Vulnerability Scoring
Analysis In Progress
CVE-2026-63834 Vulnerability Analysis & Exploit Details
CVE-2026-63834
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-2026-63834 Details
Status: Received on 19 Jul 2026, 12:16 UTC
Published on: 19 Jul 2026, 12:16 UTC
CVSS Release:
CVE-2026-63834 Vulnerability Summary
CVE-2026-63834: In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: restrict number of unacked list entries When the unacked_list is unbound, an attacker could send messages with small lengths and appropriated seqno + gaps to force the receiver to allocate more and more unacked_list entries. And the end either causing an out-of-memory situation or increase the management overhead for the (large) list that significant portions of CPU cycles are wasted in searching through the list. When limiting the list to a specific number, it is important to still correctly add a new entry to the list. But if the list became larger than the limit, the last entry of the list (with the highest seqno) must be dropped to still allow the earlier seqnos to finish and therefore to continue the process. Otherwise, the process might get stuck with too high seqnos which are not handled by batadv_tp_ack_unordered().
Assessing the Risk of CVE-2026-63834
Access Complexity Graph
The exploitability of CVE-2026-63834 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-2026-63834
No exploitability data is available for CVE-2026-63834.
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-2026-63834, 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-2026-63834, 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-2026-63834 does not compromise confidentiality.
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Integrity:
None
CVE-2026-63834 does not impact data integrity.
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Availability:
None
CVE-2026-63834 does not affect system availability.
CVE-2026-63834 References
External References
- https://git.kernel.org/stable/c/1111a3381bca2d1f084a07686bc783af5ab23df7
- https://git.kernel.org/stable/c/1c616b0be4bd8399d485e25e91859373b95d6013
- https://git.kernel.org/stable/c/1fb8762600a393d1caccd63be5d07e1756982d68
- https://git.kernel.org/stable/c/2233787658db859f0a9b83cb397cf783bb8be865
- https://git.kernel.org/stable/c/31a88792bfba142be3c9521538c1db805677381f
- https://git.kernel.org/stable/c/c6231d628d06d841bc1617b2f7034f5f39876b16
- https://git.kernel.org/stable/c/e7c775110e1858e5a7471a23a9c9658c0af9df89
- https://git.kernel.org/stable/c/f8c499fd275e59203b77fca76ae6ef2d096c2133
CWE Common Weakness Enumeration
Unknown
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