CVE-2026-0799

In BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigned 32-bit integer and must not exceed 15, but libpcap BPF interpreter does not validate the value. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading and writing the OS process memory in the 16GiB starting at the current stack frame on 64-bit architectures and in the entire address space on 32-bit architectures.

CVSS v3 8.7 HIGH

8.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.0 / Impact : 6.0

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://github.com/the-tcpdump-group/libpcap/commit/48e8960a7108e9e828f9d7bdc7e97bdab841aec7

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-05 19:16

Updated : 2026-09-08 19:20

NVD link : CVE-2026-0799

Mitre link : CVE-2026-0799

CVE.ORG link : CVE-2026-0799

JSON object : View

Products Affected

No product.

CWE

CWE-125

Out-of-bounds Read

CWE-129

Improper Validation of Array Index

CWE-787

Out-of-bounds Write

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