SB20260529188 - NULL pointer dereference in Linux kernel stmicro stmmac driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-46110)

CWE-ID: CWE-476 - NULL Pointer Dereference

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 attacker to cause a denial of service.

The vulnerability exists due to a NULL pointer dereference in stmmac_rx() and stmmac_rx_zc() in the stmmac driver when processing receive descriptors after RX memory exhaustion. A local attacker can trigger memory starvation and network receive processing to cause a denial of service.

The issue occurs when dirty descriptors with OWN=0 and NULL buffers are mistaken for completed descriptors.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0bb05e6adfa99a2ea1fee1125cc0953409f83ed8
• https://git.kernel.org/stable/c/4af2e62cbcda575a174acd230c3f3a208135e16d
• https://git.kernel.org/stable/c/5c910f7708e3c507b037ca91ca5b09f8cfe71e65
• https://git.kernel.org/stable/c/950cb436165aad0f8f2cd49da3cd07677465bcde
• https://git.kernel.org/stable/c/e1c50b273298c7cd9b08b113e7a7598b531a02f5