SB2026052206 - Out-of-bounds write in Linux kernel ipv6

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Main Vulnerability Database SB2026052206

SB2026052206 - Out-of-bounds write in Linux kernel ipv6

Published: May 22, 2026

Security Bulletin ID SB2026052206
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-43501)

CWE-ID: CWE-787 - Out-of-bounds write

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


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds write in ipv6_rpl_srh_rcv() and skb_mac_header_rebuild() when processing a crafted IPv6 packet with a recompressed type-3 source routing header. A local user can send a specially crafted raw IPv6 packet to trigger an out-of-bounds write and cause a denial of service.

Exploitation requires the ability to send an AF_INET6 SOCK_RAW packet with IPV6_HDRINCL over the loopback interface.


Remediation

Install update from vendor's website.

References