SB20260816500 - Out-of-bounds read in Linux kernel wwan iosm driver

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Main Vulnerability Database SB20260816500

SB20260816500 - Out-of-bounds read in Linux kernel wwan iosm driver

Published: August 16, 2026

Security Bulletin ID SB20260816500
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) Out-of-bounds read (CVE-ID: CVE-2026-72029)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local attacker to disclose sensitive information and cause a denial of service.

The vulnerability exists due to an out-of-bounds read and improper validation of device-supplied offsets and lengths in mux_dl_adb_decode() in the iosm MUX downlink decoder when processing modem-supplied aggregated datagram tables in a received skb. A local attacker can provide crafted offset and length values to trigger out-of-bounds reads and an infinite loop to disclose sensitive information and cause a denial of service.

The issue can be triggered by a modem that supplies malformed table and datagram metadata after the iosm net device is up, and the loop runs in softirq while cloning the skb on each pass.


Remediation

Install update from vendor's website.

References