NULL pointer dereference in Linux kernel - CVE-2026-98455

Vulnerability identifier: #VU156753

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98455

CWE-ID: CWE-476

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows a remote attacker on the local network to cause a denial of service by triggering a Linux kernel crash.

The vulnerability exists due to a null pointer dereference in the Bluetooth RFCOMM_CONNINFO getsockopt handler when processing an accepted socket whose deferred setup flag remains set after its session has been removed. A remote attacker on the local network can send a Bluetooth RFCOMM DISC frame for a channel accepted with BT_DEFER_SETUP enabled to cause a kernel crash if a local application subsequently calls getsockopt(SOL_RFCOMM, RFCOMM_CONNINFO) on that socket.

Linux kernel
Ubuntu
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-aws (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-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux (Ubuntu package) - update to 7.0.0-42.42
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
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/005b23d9e324fe5d0acbcfa70c625f2e81189046
• https://git.kernel.org/stable/c/1c4f7e1177da2f229be04139c27e5370a1cfba52
• https://git.kernel.org/stable/c/46f8ffd0a1f1eb6cbc94946a92c11ef601e228a1
• https://git.kernel.org/stable/c/4bf5ca47203049ce3648f750a53dcdc98bcc9e3e
• https://git.kernel.org/stable/c/84ae3cfd7d3a63591a2eb4faa24faf678c6708aa
• https://git.kernel.org/stable/c/8f5b30cc12c409ff62891e47ed51e6bf0945a3ea
• https://git.kernel.org/stable/c/c3aee3fc1287c8a555baf3895959087cb0c33fe8
• https://git.kernel.org/stable/c/c7362f6a18ed167f52f08ce25eeec8a7818c5004

• NULL pointer dereference in Linux kernel bluetooth rfcomm
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more
• Ubuntu update for linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx
• Ubuntu update for linux, linux-aws, linux-aws-5.15 and more