Out-of-bounds read in Linux kernel - CVE-2026-98583

Vulnerability identifier: #VU156886

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-2026-98583

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to trigger an out-of-bounds read that may cause a denial of service.

The vulnerability exists due to an out-of-bounds read in the nfcmrvl firmware download receive path when processing a short helper command frame. A local user can supply a truncated frame to cause the kernel to remove the NCI data header and read the helper command before validating the packet length, potentially causing a kernel fault and denial of service.

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/4d4601e182c8567329be7d919669ec4d847ddd93
• https://git.kernel.org/stable/c/686f942332b1667f13f3b8d6a2f50bcfbf42e277
• https://git.kernel.org/stable/c/6a17a5806e9fcd99cf0dd30c3e6301f2aa1fac3c
• https://git.kernel.org/stable/c/842c0603cfa49530ef081f181a2ddbba77a37231
• https://git.kernel.org/stable/c/a4e56f57dd04d8f9bc6bc55f90f3d129da759ec9
• https://git.kernel.org/stable/c/e4b012240c8aaf57cec192234c24e0db5f531ffa
• https://git.kernel.org/stable/c/ed2e00bb22c73156bf8030b6204deabb25cf4eb5
• https://git.kernel.org/stable/c/f15ad9d6e9173a037587dded77c904fdae8df380

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