SB20260824140 - Incorrect Calculation of Buffer Size in Linux kernel ipv4

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Main Vulnerability Database SB20260824140

SB20260824140 - Incorrect Calculation of Buffer Size in Linux kernel ipv4

Published: August 24, 2026

Security Bulletin ID SB20260824140
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) Incorrect Calculation of Buffer Size (CVE-ID: CVE-2026-74657)

CWE-ID: CWE-131 - Incorrect Calculation of Buffer Size

CVSSv4: 6.8 [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]


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

The vulnerability exists due to improper calculation of buffer size in fib_nlmsg_size() in the IPv4 routing subsystem when generating route notifications for nexthops that use RTA_VIA. A local user can trigger route notification handling involving an IPv6 gateway to cause a denial of service.

The issue can reach a kernel panic if panic_on_warn is set.


Remediation

Install update from vendor's website.

References