SB20260824232 - Out-of-bounds write in Linux kernel ipv6

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Main Vulnerability Database SB20260824232

SB20260824232 - Out-of-bounds write in Linux kernel ipv6

Published: August 24, 2026

Security Bulletin ID SB20260824232
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) Out-of-bounds write (CVE-ID: CVE-2026-74597)

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

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to corrupt memory.

The vulnerability exists due to an out-of-bounds write in ip6ip6_err() and the IPv6 ICMP error reply path when processing a quoted inner IPv6 packet after cloning an outer IPv6 ICMP error skb with stale inet6_skb_parm metadata. A remote attacker can send a specially crafted IPv6 packet to corrupt memory.

Exploitation requires the outer packet to carry a Home Address Option and a malformed inner destination-options header.


Remediation

Install update from vendor's website.

References