Out-of-bounds read in Linux kernel - CVE-2026-72033
Published: August 16, 2026
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
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-72033
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- 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