IPv6: Slab-out-of-bounds Vulnerability in fib6_nh_flush_exceptions

Kernel Updated 02 Oct 2025

Summary

03/08/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1001168: ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions. Affects Kernel versions >= f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74, < 115784bcccf135c3a3548098153413d76f16aae0. No fix is published. How to fix ↓

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Background

The Linux Kernel is an open-source monolithic Unix-like computer operating system kernel. It provides the core functionality for various Linux distributions. The kernel handles the communication between hardware and software components of a computer system. It includes device drivers, memory management, process management, and file system support. The IPv6 subsystem in the Linux Kernel is responsible for handling Internet Protocol version 6 (IPv6) networking. IPv6 is the successor to IPv4 and provides a larger address space and improved network security. The fib6_nh_flush_exceptions function in the IPv6 subsystem is vulnerable to a slab-out-of-bounds issue.

Vulnerability Detail

The slab-out-of-bounds vulnerability in the fib6_nh_flush_exceptions function of the Linux Kernel's IPv6 subsystem allows an attacker to access memory outside the bounds of an allocated slab. This can lead to information disclosure or the execution of arbitrary code. The vulnerability was introduced in version 5.3 of the Linux Kernel and was fixed in version 5.13.6. An attacker could exploit this vulnerability by sending specially crafted network packets to a vulnerable system. The impact and attack plausibility of this vulnerability have not been proven yet.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

There is no known workaround for this vulnerability at the moment. It is advised to apply the official patch or update the Linux Kernel to the fixed version.

Conclusion

The slab-out-of-bounds vulnerability in the fib6_nh_flush_exceptions function of the Linux Kernel's IPv6 subsystem can potentially lead to information disclosure or the execution of arbitrary code. It is recommended to update the Linux Kernel to version 5.13.6 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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