SB20260507266 - Improper input validation in Linux kernel net wan driver
Published: May 7, 2026
Security Bulletin ID
SB20260507266
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-43103)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 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/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper input validation in the lapbether device event handling when processing network device type change events. A local user can trigger a device type change to cause a denial of service.
The issue occurs because lapbeth_data_transmit() expects the underlying device type to be ARPHRD_ETHER.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/328bb2cff5c2ed973f595ded769e15f4b7a117be
- https://git.kernel.org/stable/c/363a38044b8cd5b496d241651a1fb666e7c5fe3e
- https://git.kernel.org/stable/c/63851f60781aa89258c8f0952cd13940aab0888e
- https://git.kernel.org/stable/c/b117056768ab7deb434e7d72065e48d2083a0c2a
- https://git.kernel.org/stable/c/b120e4432f9f56c7103133d6a11245e617695adb