SB2026102383 - NULL pointer dereference in Linux kernel ipv4

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Main Vulnerability Database SB2026102383

SB2026102383 - NULL pointer dereference in Linux kernel ipv4

Published: October 23, 2026

Security Bulletin ID SB2026102383
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) NULL pointer dereference (CVE-ID: CVE-2026-99072)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to cause a denial of service through a kernel crash.

The vulnerability exists due to a NULL pointer dereference in IPv4 route notification sizing when a nexthop group shrinks during asynchronous hardware flag notification processing. A local privileged user can trigger replacement of a nexthop group with fewer paths while fib_nlmsg_size() iterates over it, causing fib_info_nhc() to return NULL that fib_nexthop_nlmsg_size() dereferences, to cause a denial of service.


Remediation

Install update from vendor's website.

References