Improper Check for Unusual or Exceptional Conditions in Linux kernel - CVE-2026-45940
Published: May 28, 2026
Vulnerability identifier: #VU132545
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-45940
CWE-ID: CWE-754
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper handling of descriptor length calculation in stmmac_napi_poll_rx when processing packets with split header enabled on GMAC4 hardware. A remote attacker can send network traffic that triggers incorrect payload length handling to cause a denial of service.
The issue occurs in rare cases when the hardware does not fill buf2 of the first descriptor with payload.
How to mitigate CVE-2026-45940
Install security update from vendor's repository.