Improper input validation in Linux kernel - CVE-2026-63878
Published: July 20, 2026
Vulnerability identifier: #VU138778
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-63878
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper input validation in GEM_OP GET_MAPPING_INFO handling in amdgpu_gem.c when processing a user-supplied num_entries value. A local user can supply an oversized num_entries value to cause a denial of service.
On systems configured with CONFIG_PANIC_ON_WARN=y, the issue can lead to a kernel panic.
How to mitigate CVE-2026-63878
Install security update from vendor's repository.