SB20261023121 - Use-after-free in Linux kernel ice devlink driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-99044)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to potentially cause a denial of service through a kernel crash.

The vulnerability exists due to a use-after-free in the Linux kernel ice driver's ice_dealloc_dynamic_port() function when cleaning up a dynamic port. A local privileged user can trigger the affected cleanup path, which reads dyn_port->vsi->idx after freeing the VSI to remove an entry from pf->dyn_ports, to potentially cause a denial of service through a kernel crash.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1402fc67d2f4e2e1fc7bf8ee0825b8ad994557ff
• https://git.kernel.org/stable/c/7c1344df1ae0579f57b97647e5203b06496ce10c
• https://git.kernel.org/stable/c/b98eb58ba2f8fe8e9bba1b8a3b94fa5602c6de84
• https://git.kernel.org/stable/c/ca8a6285b11d01e5a279b1aa7fb55b1a02ecebb1