NULL pointer dereference in Linux kernel - CVE-2026-46188

Vulnerability identifier: #VU133004

CSH Severity: Low

CVSS v4: 6.8 [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]

CVE-ID: CVE-2026-46188

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a NULL pointer dereference in __octep_vf_oq_process_rx() when processing received packets after napi_build_skb() allocation failure. A local user can trigger allocation failure conditions to cause a denial of service.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 7.0.0-28.28, 7.0.0-28.28.1, 7.0.0-1003.4, 7.0.0-1008.8
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1009.9
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15

• https://git.kernel.org/stable/c/60246cdd4c515ea7d920cddf48932efcb990773e
• https://git.kernel.org/stable/c/6fef6640bbf360e254cc0174365ed30ce3a07572
• https://git.kernel.org/stable/c/b0f4711b426a06fb4c4be85c36b9f5588d5140d3
• https://git.kernel.org/stable/c/dd66b42854705e4e4ee7f14d260f86c578bed3e3

• NULL pointer dereference in Linux kernel marvell octeon_ep_vf driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws