Incorrect Calculation of Buffer Size in Linux kernel - CVE-2026-68287
Published: August 12, 2026
Vulnerability identifier: #VU142015
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-2026-68287
CWE-ID: CWE-131
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 improper calculation of buffer size in net/core/drop_monitor.c when handling 64-bit drop monitor attributes on affected architectures. A local user can trigger packet report generation to cause a denial of service.
This affects 32-bit architectures without CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS because 64-bit netlink attributes may require additional padding for alignment.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-68287
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.111-1
linux (Debian package) - update to 6.12.111-1