CVE-2026-74258
Received Received - Intake

BPF uprobe_multi Access Validation Flaw

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Guard __get_user acesss with access_ok for uprobe_multi data As reported by sashiko [1] we need to use access_ok to check the user space data bounds before we use __get-user to get it. [1] https://lore.kernel.org/bpf/20260610145235.CB1441F00893@smtp.kernel.org/

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Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-74258
EUVD
EUVD-2026-59405

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a missing bounds check when accessing user space data in the BPF subsystem. Specifically, the code fails to use access_ok to verify the safety of user space memory before using __get_user to read data for uprobe_multi functionality.

Detection Guidance

This vulnerability is specific to the Linux kernel's BPF subsystem and requires kernel-level detection. Check if your kernel version includes the fix by running uname -a and comparing against patched versions. Monitor kernel logs for uprobe_multi related errors or crashes.

Impact Analysis

This could allow an attacker to exploit memory access issues, potentially leading to crashes, privilege escalation, or unauthorized data access. Systems using BPF features with uprobe_multi may be vulnerable to memory corruption or security bypasses.

Mitigation Strategies

Update your Linux kernel to the latest patched version immediately. If patching is not immediately possible, disable BPF and uprobe_multi functionality as a temporary workaround. Monitor vendor advisories for kernel updates.

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