Out-of-bounds read in Linux kernel - CVE-2026-68187
Published: August 12, 2026
Vulnerability identifier: #VU142130
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-2026-68187
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 transfer_args_to_stack() when processing execve arguments on affected no-MMU builds. A local user can supply an excessively long argument or environment string to trigger the faulty loop behavior and cause a denial of service.
Only CONFIG_MMU=n builds are affected, and the vulnerable code path is used by binfmt_flat and binfmt_elf_fdpic.
Affected software
Linux kernel
How to mitigate CVE-2026-68187
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/16cc4f5c1c4b9e45eca7f7deefa5410a292db599
- https://git.kernel.org/stable/c/2bc6bf70d41055377f390d06f0f3521deb62fd3b
- https://git.kernel.org/stable/c/55fa2c7f2b15583d1a2fe1b5abcc24377359339f
- https://git.kernel.org/stable/c/c62bb00caba66e01fb578d5f0302f247dc64930a
- https://git.kernel.org/stable/c/dfc2a00742af4cb7251c1a8fbce4fbae3cc0de4e