SB20261023219 - Numeric Truncation Error in Linux kernel core

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Main Vulnerability Database SB20261023219

SB20261023219 - Numeric Truncation Error in Linux kernel core

Published: October 23, 2026

Security Bulletin ID SB20261023219
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Numeric Truncation Error (CVE-ID: CVE-2026-98955)

CWE-ID: CWE-197 - Numeric Truncation Error

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause incorrect transport-header identification during network packet processing.

The vulnerability exists due to integer truncation in the Linux kernel's __skb_flow_dissect() function when computing transport-header offsets using lengths cast to 16-bit integers before comparison. A local user can supply an oversized packet whose length modulo 65536 is smaller than the computed header offset to cause callers to identify an incorrect location as the transport header, potentially pointing inside the Ethernet header.


Remediation

Install update from vendor's website.

References