SB20261022419 - 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-2026-98803)

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

CVSSv4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker on the local network to cause oversized network frames to be forwarded in truncated form.

The vulnerability exists due to improper handling of multi-buffer frames in the stmmac native XDP receive path when jumbo frames are enabled and an accepted frame extends into the secondary receive buffer. A remote attacker on the local network can send an oversized frame to make the XDP program process only the primary buffer, causing truncated forwarding if the program returns a TX or REDIRECT verdict.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/358d5ac5a5d57ce21c3814c4e3e8f3fbcb7304b4
• https://git.kernel.org/stable/c/88095728511e0df9c89528944f5a1762ad298983
• https://git.kernel.org/stable/c/a7cff44543f66f3a19151060cb549691d191d44c