Out-of-bounds read in Linux kernel - CVE-2026-72033

Vulnerability identifier: #VU143556

CSH Severity: Low

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

CVE-ID: CVE-2026-72033

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in fill_from_part() in the OrangeFS directory handling code when processing a crafted readdir entry trailer supplied by a userspace client. A local user can supply a crafted directory entry with a wrapped length value to cause a denial of service.

The issue occurs because a directory entry size computed in size_t is truncated to a 32-bit value, which can bypass a bounds check and lead to a read far past the directory part.

Linux kernel
Ubuntu
linux-nvidia (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux (Ubuntu package)
linux-gke (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-gcp (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 6.8.0-1035.38
linux (Ubuntu package) - addressed in versions 7.0.0-34.34~24.04.1, 7.0.0-34.34, 7.0.0-34.34.1, 7.0.0-1012.12~24.04.1, 7.0.0-1013.13~24.04.1, 7.0.0-1013.13, 7.0.0-1014.14, 7.0.0-1020.20
linux-gke (Ubuntu package) - update to 7.0.0-1007.8
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1012.12~24.04.1
linux-gcp (Ubuntu package) - addressed in versions 7.0.0-1013.13~24.04.1, 7.0.0-1013.13, 7.0.0-1014.14
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/07c05601a9a8e5d4481b2a4a16dc0e3c5bc63ad9
• https://git.kernel.org/stable/c/1679780f482feeb82acb5995587d4fb1d1fe82fd
• https://git.kernel.org/stable/c/18227a6bc98bd0ba96ed3ce9d5b28776a5a28dfc
• https://git.kernel.org/stable/c/36723b28e3293047f087f4501f1ef4ead418dd84
• https://git.kernel.org/stable/c/82fc886e244c76fadf05ef1958aaf8815478ccde
• https://git.kernel.org/stable/c/a72bbb43689591c9d36e3bb45c2d4e688cf92682
• https://git.kernel.org/stable/c/e3d325c0bdb7bc5d1b4cc8d8441d79794cd03729
• https://git.kernel.org/stable/c/fdf06a1b66ff39664b01c6bb6a2aa98d81e8ebe1

• Out-of-bounds read in Linux kernel orangefs
• Ubuntu update for linux-gcp
• Ubuntu update for linux
• Ubuntu update for linux-oracle-7.0
• Ubuntu update for linux-nvidia-tegra
• Ubuntu update for linux-gke
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux-azure