SB2026101625 - Use-after-free in Linux kernel ipv4

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Main Vulnerability Database SB2026101625

SB2026101625 - Use-after-free in Linux kernel ipv4

Published: October 16, 2026

Security Bulletin ID SB2026101625
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) Use-after-free (CVE-ID: CVE-2026-98432)

CWE-ID: CWE-416 - Use After Free

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 potentially cause a denial of service through access to freed IPv6 request socket options.

The vulnerability exists due to use-after-free in tcp_v6_reqsk_destructor() when request socket migration leaves concurrent processing using shared options after they have been freed. A remote attacker can send TCP traffic that encounters concurrent request socket migration and destruction to potentially cause a kernel crash.

The affected ipv6_opt options are only set by CALIPSO.


Remediation

Install update from vendor's website.

References