SB20260507157 - Heap-based buffer overflow in Linux kernel ipv6

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Main Vulnerability Database SB20260507157

SB20260507157 - Heap-based buffer overflow in Linux kernel ipv6

Published: May 7, 2026

Security Bulletin ID SB20260507157
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Heap-based buffer overflow (CVE-ID: CVE-2026-43186)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a heap-based buffer overflow in __ioam6_fill_trace_data() when processing a crafted incoming IPv6 IOAM packet on the receive path. A remote attacker can send a specially crafted packet to cause a denial of service.

A packet with an inconsistent nodelen field and type bits can trigger an out-of-bounds write of about 100 bytes into adjacent heap memory.


Remediation

Install update from vendor's website.

References