Use-after-free in Linux kernel - CVE-2026-98544

Vulnerability identifier: #VU156846

CSH Severity: Low

CVSS v4: 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]

CVE-ID: CVE-2026-98544

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to potentially cause a denial of service by crashing the kernel.

The vulnerability exists due to use-after-free in the Linux kernel bna Ethernet driver when tearing down a device or cleaning up a failed probe. A local privileged user can potentially exploit mutually rearming IOC timers to cause bnad_iocpf_timeout() to access bnad->bna_lock after free_netdev() has freed the containing struct bnad, potentially crashing the kernel.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/28e32ace754b57534ef0ca0fb99bcbea5b13ba2a
• https://git.kernel.org/stable/c/4d97a141e85a034566c33c7ed854c8a3e8a268f1
• https://git.kernel.org/stable/c/77b1718e39e5c9f6956fb60807326af20baf889d
• https://git.kernel.org/stable/c/e09d1c6729ee4a7812128902d9274ff565f958b8
• https://git.kernel.org/stable/c/f04cbdfac9b8284146995ab7ba0d054ad1d20ec6

• Use-after-free in Linux kernel brocade bna driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more