Numeric Truncation Error in Linux kernel - CVE-2026-98884

Vulnerability identifier: #VU157618

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98884

CWE-ID: CWE-197

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service by triggering a kernel crash.

The vulnerability exists due to integer truncation in the Linux kernel MMC core when an excessively large host-provided max_segs value is truncated to zero. A local user can trigger MMC request initialization with such an invalid host configuration to cause a zero-size scatter-gather allocation and a subsequent invalid memory access in sg_init_table(), crashing the kernel.

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/03f5a16ec85beebabd5ab5e67ac1527f87908ded
• https://git.kernel.org/stable/c/3e0483e93a8be320f70a1ff68d835f7f015af311
• https://git.kernel.org/stable/c/9cca3c0c1472d6204ef8a78a6e7b3afe9610b22e
• https://git.kernel.org/stable/c/a8283f7d93f0d9336b15618b9665279ff6944319
• https://git.kernel.org/stable/c/b037c2f7794aa01ee2a00e43c29645fd2dd2dfb9
• https://git.kernel.org/stable/c/c465608bd25d7f8565be7817a6a36a5d69f8aa14

• Numeric Truncation Error in Linux kernel mmc core 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