SB20260528133 - Improper Check for Unusual or Exceptional Conditions in Linux kernel stmicro stmmac driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-45940)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/36f81cb7d82e9614a7058da6abdf2e3a03993df1
• https://git.kernel.org/stable/c/b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609
• https://git.kernel.org/stable/c/babab1b42ed68877ef669a08384becf281ad2582