Out-of-bounds write in Linux kernel - CVE-2026-72197

Vulnerability identifier: #VU143392

CSH Severity: Low

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

CVE-ID: CVE-2026-72197

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows an attacker with physical access to cause a denial of service.

The vulnerability exists due to an out-of-bounds write in do_action() in fs/ntfs3/fslog.c when processing a crafted NTFS image during mount. An attacker with physical access can provide a specially crafted NTFS image to cause a denial of service.

The issue is triggered in the DeleteIndexEntryAllocation case when an on-disk INDEX_BUFFER entry contains a malformed size value, causing memmove() to use an invalid length. User interaction is required to mount the crafted filesystem image.

Linux kernel
Ubuntu
linux-nvidia (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1036.39+1
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux (Ubuntu package) - addressed in versions 7.0.0-38.38, 7.0.0-38.38.1, 7.0.0-1008.9, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1015.15
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

• https://git.kernel.org/stable/c/09fddd52c1b0cef2c086d61be8f3d5dc92e36565
• https://git.kernel.org/stable/c/4c8aac931c1cd70347961ba5157aa916448c6a25
• https://git.kernel.org/stable/c/554700c65d398276cb00a8ef95f1d5e00b9eff93
• https://git.kernel.org/stable/c/b509b9613f20dc5b653d54bf78fab00d79cc43c8
• https://git.kernel.org/stable/c/c38ed2ab62fab75fd6d0fdc2bee540fbebc7b959
• https://git.kernel.org/stable/c/f383aae59ec3994c14804f4191c59038b206be81
• https://git.kernel.org/stable/c/fc4626bb3656362de8b0ecd56605d47a19ec3518

• Out-of-bounds write in Linux kernel ntfs3
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux-nvidia-tegra
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-oem-7.0