CVE-2026-31412
Vulnerability Scoring
Analysis In Progress
CVE-2026-31412 Vulnerability Analysis & Exploit Details
CVE-2026-31412
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-2026-31412 Details
Status: Received on 10 Apr 2026, 11:16 UTC
Published on: 10 Apr 2026, 11:16 UTC
CVSS Release:
CVE-2026-31412 Vulnerability Summary
CVE-2026-31412: In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_mass_storage: Fix potential integer overflow in check_command_size_in_blocks() The `check_command_size_in_blocks()` function calculates the data size in bytes by left shifting `common->data_size_from_cmnd` by the block size (`common->curlun->blkbits`). However, it does not validate whether this shift operation will cause an integer overflow. Initially, the block size is set up in `fsg_lun_open()` , and the `common->data_size_from_cmnd` is set up in `do_scsi_command()`. During initialization, there is no integer overflow check for the interaction between two variables. So if a malicious USB host sends a SCSI READ or WRITE command requesting a large amount of data (`common->data_size_from_cmnd`), the left shift operation can wrap around. This results in a truncated data size, which can bypass boundary checks and potentially lead to memory corruption or out-of-bounds accesses. Fix this by using the check_shl_overflow() macro to safely perform the shift and catch any overflows.
Assessing the Risk of CVE-2026-31412
Access Complexity Graph
The exploitability of CVE-2026-31412 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-2026-31412
No exploitability data is available for CVE-2026-31412.
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-2026-31412, 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-2026-31412, 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-2026-31412 does not compromise confidentiality.
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Integrity:
None
CVE-2026-31412 does not impact data integrity.
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Availability:
None
CVE-2026-31412 does not affect system availability.
CVE-2026-31412 References
External References
- https://git.kernel.org/stable/c/228b37936376143f4b60cc6828663f6eaceb81b5
- https://git.kernel.org/stable/c/3428dc5520c811e66622b2f5fa43341bf9a1f8b3
- https://git.kernel.org/stable/c/387ebb0453b99d71491419a5dc4ab4bee0cacbac
- https://git.kernel.org/stable/c/8479891d1f04a8ce55366fe4ca361ccdb96f02e1
- https://git.kernel.org/stable/c/91817ad5452defe69bc7bc0e355f0ed5d01125cc
- https://git.kernel.org/stable/c/ce0caaed5940162780c5c223b8ae54968a5f059b
CWE Common Weakness Enumeration
Unknown
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