SB20261007126 - Unchecked Return Value in Linux kernel net wwan driver

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Main Vulnerability Database SB20261007126

SB20261007126 - Unchecked Return Value in Linux kernel net wwan driver

Published: October 7, 2026

Security Bulletin ID SB20261007126
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Unchecked Return Value (CVE-ID: CVE-2026-98236)

CWE-ID: CWE-252 - Unchecked Return Value

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


The vulnerability allows a local user to disclose kernel heap memory to the network stack.

The vulnerability exists due to an unchecked return value from skb_copy_bits() in mhi_mbim_rx() when processing modem-supplied network transfer blocks. A local user can supply a datagram pointer entry that references data outside the received socket buffer, causing a failed copy and subsequent delivery of an uninitialized buffer to netif_rx(), to disclose kernel heap memory to the network stack.


Remediation

Install update from vendor's website.

References