Out-of-bounds read in Linux kernel - CVE-2026-98481

Vulnerability identifier: #VU156781

CSH Severity: Medium

CVSS v4: 5.1 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98481

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows an attacker with physical access to system to trigger an out-of-bounds kernel memory read that may cause a denial of service.

The vulnerability exists due to an out-of-bounds read in the Linux kernel NFC port100 driver when validating device-supplied response frames without checking their declared length against the actual received length. An attacker with physical access to system can supply a response with a 16-bit datalen value exceeding the received data length to make port100_data_checksum() read past the transfer buffer, potentially causing a kernel crash.

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/035056e07ea65be670284246d9bc62f2f00ff4a3
• https://git.kernel.org/stable/c/092c6a605cbd6414ef499834c2e0da69c2c3388e
• https://git.kernel.org/stable/c/0d482995f0cdd0302450aa300c684c642d8ab31f
• https://git.kernel.org/stable/c/144ad477c381e2c592b64898d04ab4ce03b32861
• https://git.kernel.org/stable/c/14b1467cfc6630583650f33538174c5a1ec685ab
• https://git.kernel.org/stable/c/9e8df087826b9999d1b83b06f5d85675d5a69c9e
• https://git.kernel.org/stable/c/db66a30588630c7de30ef033f00daddef69f6ad9
• https://git.kernel.org/stable/c/e4da1452e10c6472a4bac48dc2f6a35fff1fcd69

• Out-of-bounds read in Linux kernel nfc driver
• 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