Uncontrolled Recursion in Linux kernel - CVE-2026-80554
Published: August 27, 2026
Vulnerability identifier: #VU145937
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80554
CWE-ID: CWE-674
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to uncontrolled recursion in vfio_ccw channel program processing when handling channel programs with many TIC-linked segments. A remote attacker can supply a crafted channel program to execute arbitrary code.
The issue arises because channel programs are processed recursively and segment counts created by Transfer-In-Channel (TIC) CCWs were not equivalently limited.
Affected software
Linux kernel
How to mitigate CVE-2026-80554
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb2
- https://git.kernel.org/stable/c/15fb4559a7fdf0b8725e433a71cfd03a1313a48b
- https://git.kernel.org/stable/c/4ee94790490ae8dcc97df8597f07836c8a81bbcf
- https://git.kernel.org/stable/c/5405c90d6a47b3014e74ee0618a162449abbbc93
- https://git.kernel.org/stable/c/a1625f66eaa1200068a0e2c05bc90e65182fc4e3