Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2024-56702
CVE-2024-56702:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2024-56702 affects the Linux kernel's BPF subsystem, specifically related to how raw tracepoint arguments are handled. The vulnerability was discovered when it was found that arguments to a raw tracepoint are tagged as trusted with the assumption that pointers will be non-NULL, but in reality, these arguments can be NULL. This discrepancy between the verifier's assumptions and actual behavior could potentially lead to kernel crashes (Kernel Git).
Technical details
The vulnerability exists in the BPF verifier's handling of raw tracepoint arguments. The verifier incorrectly assumes that trusted pointers will never be NULL, causing it to delete explicit NULL checks. When these pointers are actually NULL, accessing them could crash the kernel. The issue has a CVSS v3.1 Base Score of 5.5 (MEDIUM) with vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (NVD).
Impact
The vulnerability can lead to a denial of service (system crash) when a raw tracepoint argument is NULL and is dereferenced without proper checks. This affects the kernel's stability and availability (NVD).
Mitigation and workarounds
The issue has been fixed by marking raw tracepoint arguments with PTRMAYBENULL and implementing special case handling for dereferencing and pointer arithmetic. The fix includes updates to the verifier to properly handle these cases and ensure safe dereferencing of potentially NULL pointers. The patch has been applied to Linux kernel versions 6.2 through 6.11.11 and 6.12 through 6.12.2 (Kernel Git).
Additional resources
Source: This report was generated using AI
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