Out-of-bounds write in Linux kernel - CVE-2026-98532

Vulnerability identifier: #VU156834

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98532

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to corrupt kernel memory and potentially cause a denial of service.

The vulnerability exists due to out-of-bounds memory access in the Linux kernel's ipv6_find_hdr() function when processing IPv6 extension headers whose declared lengths exceed the remaining packet data. A local user can submit a specially crafted IPv6 packet for processing through Open vSwitch to cause update_ipv6_checksum() to read and write a transport checksum field outside the packet buffer, corrupting kernel memory and 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/1c70275ca87e769e1a52abc644d61372d8c016cb
• https://git.kernel.org/stable/c/1d42828565889632068fbc2983c34d57c66af4e0
• https://git.kernel.org/stable/c/4254d5878c320c19961dd0b8e1d0aca4800d8b7d
• https://git.kernel.org/stable/c/531255de8971c06d5d5986f85fdc2525d707ba71
• https://git.kernel.org/stable/c/543354c6efb27eae3372a3a9674aeaa2a86e2b2c
• https://git.kernel.org/stable/c/ca96b38730e31357ef4a9d76af1336958ac670d7
• https://git.kernel.org/stable/c/dc92cb972e86790b8078337ec41015b748b8f8e5
• https://git.kernel.org/stable/c/ee319bd3a0e976af5087cbe59ebc50a66f31d202

• Out-of-bounds write in Linux kernel ipv6
• 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