SB20261022151 - Use-after-free in Linux kernel broadcom genet driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-98574)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to corrupt kernel memory and potentially cause a denial of service.

The vulnerability exists due to a use-after-free in the Linux kernel bcmgenet Ethernet driver when transmit queues are disabled before transmit NAPI processing stops. A local privileged user can trigger an affected interface transition while transmit completions are in flight to cause a queue to be reawakened and a subsequent transmission to write to freed transmit rings, potentially crashing the system.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/63bcc2fee6419963e45e7c2cd698fa862409601d
• https://git.kernel.org/stable/c/7e87508b5c4d81210d0a736ed01962e52f5c4c56
• https://git.kernel.org/stable/c/f329d42423089904758f2685cda295de9bf99441