CVE-2026-23359
Vulnerability Scoring
Analysis In Progress
CVE-2026-23359 Vulnerability Analysis & Exploit Details
CVE-2026-23359
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-2026-23359 Details
Status: Awaiting Analysis
Last updated: 🕘 18 Apr 2026, 09:16 UTC
Originally published on: 🕚 25 Mar 2026, 11:16 UTC
Time between publication and last update: 23 days
CVSS Release:
CVE-2026-23359 Vulnerability Summary
CVE-2026-23359: In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stack-out-of-bounds write in devmap get_upper_ifindexes() iterates over all upper devices and writes their indices into an array without checking bounds. Also the callers assume that the max number of upper devices is MAX_NEST_DEV and allocate excluded_devices[1+MAX_NEST_DEV] on the stack, but that assumption is not correct and the number of upper devices could be larger than MAX_NEST_DEV (e.g., many macvlans), causing a stack-out-of-bounds write. Add a max parameter to get_upper_ifindexes() to avoid the issue. When there are too many upper devices, return -EOVERFLOW and abort the redirect. To reproduce, create more than MAX_NEST_DEV(8) macvlans on a device with an XDP program attached using BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS. Then send a packet to the device to trigger the XDP redirect path.
Assessing the Risk of CVE-2026-23359
Access Complexity Graph
The exploitability of CVE-2026-23359 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-2026-23359
No exploitability data is available for CVE-2026-23359.
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-2026-23359, 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-2026-23359, 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-2026-23359 does not compromise confidentiality.
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Integrity:
None
CVE-2026-23359 does not impact data integrity.
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Availability:
None
CVE-2026-23359 does not affect system availability.
CVE-2026-23359 References
External References
- https://git.kernel.org/stable/c/5000e40acc8d0c36ab709662e32120986ac22e7e
- https://git.kernel.org/stable/c/75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2
- https://git.kernel.org/stable/c/88df604f0d16a692867582350ce3f2fcd22243f1
- https://git.kernel.org/stable/c/8a95fb9df1105b1618872c2846a6c01e3ba20b45
- https://git.kernel.org/stable/c/b7bf516c3ecd9a2aae2dc2635178ab87b734fef1
- https://git.kernel.org/stable/c/ca831567908fd3f73cf97d8a6c09a5054697a182
- https://git.kernel.org/stable/c/d2c31d8e03d05edc16656e5ffe187f0d1da763d7
CWE Common Weakness Enumeration
Unknown
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