Integer underflow in Linux kernel - CVE-2026-72195

Vulnerability identifier: #VU143390

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-72195

CWE-ID: CWE-191

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an integer underflow leading to an out-of-bounds read in do_action() UpdateResidentValue handling in fs/ntfs3/fslog.c when processing a crafted on-disk NTFS log record during mount. A local user can supply a crafted filesystem image to trigger an oversized resident attribute data_size and disclose sensitive information.

The issue occurs when attr_off and redo_len from the on-disk log record make aoff + dlen smaller than data_off, causing data_size to wrap to nearly 4 GiB.

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/50b5e83384e7fed3d11d18b79ff350e9d6d89861
• https://git.kernel.org/stable/c/53c12f178f584dc5f836ffe2782138a6e9348ed9
• https://git.kernel.org/stable/c/546518468e6c9ea469669eef78f8cc380ad6e2ca
• https://git.kernel.org/stable/c/97758fd9756b5f09e9ddc6a5f6a569041acc8421
• https://git.kernel.org/stable/c/a89c66674283a0293c0f266dc57087a6114371a3
• https://git.kernel.org/stable/c/ab8761676d638c5be170aaf91b7ffdd451236616
• https://git.kernel.org/stable/c/d1570c48f49a693974d000251030370ee2e83539

• Integer underflow 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