SB20261022198 - Use-after-free in Linux kernel meta fbnic driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-98616)

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 cause a denial of service by triggering a kernel crash.

The vulnerability exists due to use-after-free in the Linux kernel fbnic Ethernet driver when closing a network device after failed PCIe error recovery or a failed datapath reopen during resume. A local privileged user can trigger the affected teardown sequence to cause fbnic_dbg_down() to dereference freed NAPI vectors because num_napi retains a nonzero count, resulting in a kernel crash.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4bcc4a92c603fe7f062cea22e20da2e0ad6b12c3
• https://git.kernel.org/stable/c/4f4b767ffea7653a00904383908536e754f8ef5b
• https://git.kernel.org/stable/c/c5b5aee41b9f5ed0743344be1c7b544555fa3cb9