Out-of-bounds read in Linux kernel - CVE-2026-98485

Vulnerability identifier: #VU156785

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98485

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service by triggering a kernel panic.

The vulnerability exists due to an out-of-bounds read in the Linux kernel netfilter rt_mt6() function when processing IPv6 routing addresses under a non-strict address-matching rule with IP6T_RT_FST_MASK set and rtinfo->addrnr equal to zero. A remote attacker can send a crafted IPv6 packet containing matching routing addresses to advance the address index beyond the 16-entry array and cause a denial of service through a kernel panic.

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/191239b0939692e92459d8d32cad14247fa93f89
• https://git.kernel.org/stable/c/5a54f8b7f7fe207a5c14713015a5820588faf1ad
• https://git.kernel.org/stable/c/82313c169eddc02b1bf5ba6b427803e272d3ec42
• https://git.kernel.org/stable/c/959d1829d1ce8b91b435b24a923b51bcc8897090
• https://git.kernel.org/stable/c/b89249819a7d6698bed152feafd3bc6c08489d15
• https://git.kernel.org/stable/c/d9cf4ac6f326330e1fe4d95671d36a6ff3593f64
• https://git.kernel.org/stable/c/dd55c0ea87bf70e4e4b3b683acd29ef981335b26
• https://git.kernel.org/stable/c/fe336bab13834394320997de8b16ca4a913b4f13

• Out-of-bounds read in Linux kernel ipv6 netfilter
• 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